Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected. Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.

The remote Redhat Enterprise Linux 10 / 8 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:93618 advisory.

    Red Hat JBoss Web Server is a fully integrated and certified set of components for hosting Java web     applications. It is comprised of the Apache Tomcat Servlet container, JBoss HTTP Connector (mod_cluster),     the PicketLink Vault extension for Apache Tomcat, and the Tomcat Native library.

    This release of Red Hat JBoss Web Server 7.0.3 serves as a replacement for Red Hat JBoss Web Server 7.0.2.
    This release includes bug fixes, enhancements and component upgrades, which are documented in the Release     Notes that are linked to in the References section.

    Security Fix(es):

    * mod_cluster-core: mod_cluster Advertise Listener: unauthenticated DoS via crafted multicast datagram     (CVE-2026-76166)
    * jws7-tomcat-native: Apache Tomcat Native: Client certificate verification requirements can be down-     graded via race condition (CVE-2026-86247)
    * jws7-tomcat: Apache Tomcat: Denial of Service via AJP request (CVE-2026-78383)
    * jws7-tomcat: Apache Tomcat: Denial of Service via busy wait during WebSocket close (CVE-2026-77791)
    * jws7-tomcat: Apache Tomcat: HTTP/2 request smuggling due to header mix-up (CVE-2026-86350)
    * jws7-tomcat: Apache Tomcat: Authentication Bypass in WebSocket Endpoints (CVE-2026-76183)
    * jws7-tomcat: Apache Tomcat: Denial of Service due to lost asynchronous WebSocket write timeouts     (CVE-2026-79677)
    * jws7-tomcat: Apache Tomcat: TLS implementations ignore Certificate Revocation Lists (CVE-2026-73581)
    * jws7-tomcat: Apache Tomcat: OCSP checks sometimes soft-fail with FFM even when soft-fail is disabled     (CVE-2026-86248)
    * jws7-tomcat-native: Apache Tomcat Native: Denial of Service via buffer over-read during TLS handshake     (CVE-2026-86243)
    * jws7-tomcat-native: Apache Tomcat Native: Weakened TLS connection security via insecure default     configuration (CVE-2026-86246)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of tomcat-native installed on the remote host is prior to 1.2.38-2. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-4016 advisory.

    Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate     verification requirements to be down-graded for some configurations.

    This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported     versions may also be affected.

    Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue. (CVE-2026-86247)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user
    to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from
    1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade
    to version 1.3.9 or 2.0.16, which fix the issue. (CVE-2026-86243)

  - Initialization of a resource with an insecure default vulnerability in Apache Tomcat Native enabled
    insecure options by default including ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET,
    IGNORE_UNEXPECTED_EOF and ALLOW_NO_DHE_KEX. This issue affects Apache Tomcat Native: from 2.0.0 through
    2.0.15, from 1.3.0 through 1.3.8. Earlier unsupported versions may also be affected. Users are recommended
    to upgrade to version 2.0.16 or 1.3.9, which fix the issue. (CVE-2026-86246)

  - Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate
    verification requirements to be down-graded for some configurations. This issue affects Apache Tomcat
    Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected.
    Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue. (CVE-2026-86247)

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4658-1 advisory.

    - CVE-2026-86243: buffer overread during the TLS handshake permits a malicious user to trigger a DoS via a     JVM crash       (bsc#1282623).
    - CVE-2026-86246: insecure ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF     and       ALLOW_NO_DHE_KEX options enabled by default (bsc#1282622).
    - CVE-2026-86247: race condition allows client certificate verification requirements to be down-graded for     some       configurations (bsc#1282621).

    Changes for libtcnative-2-0:

    - Upgrade to version 2.0.16
     * Security fixes      + Client certificate requirements can be down-graded      (bsc#1282621, CVE-2026-86247)      A race condition allowed client certificate verification      requirements to be down-graded for some configurations.
     + Insecure OpenSSL options enabled (bsc#1282622, CVE-2026-86246)      Apache Tomcat Native enabled insecure options by default      including ALLOW_CLIENT_RENEGOTIATION,      NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF and      ALLOW_NO_DHE_KEX.
     + DoS via TLS handshake (bsc#1282623, CVE-2026-86243)      A buffer over-read vulnerability in Apache Tomcat Native      during the TLS handshaking permits a malicious user to trigger      a DoS via a JVM crash.
     * Changes      + Code: Remove call to ERR_remove_thread_state() from Windows      specific code to allow building with OpenSSL 4.0.x      ERR_remove_thread_state() is a no-op in OpenSSL 1.1+ and got      removed in OpenSSL 4      + Update: Remove support for Windows build on IA64 architecture      (Itanium)      + Update: Make x64 the default architecture for Windows build      + Update: Make Windows 10 / 11 the default target version for      Windows builds      + Fix: Fix a potential crash when negotiating ALPN      + Fix: If ALPN negotiation fails and failure is configured to      use the last server protocol in the list, use it rather than      the last protocol offered by the client      + Fix: Add support for the extended range of options available      from OpenSSL 3.0.x. The options flag is now a 64-bit unsigned      int (represented by a Java long) rather than a 32-bit unsigned      int (represented by a Java int)      + Code: Remove unused code      + Fix: Ensure that per connection changes to certificate      verification settings, e.g. to support client certificate      authentication, do not modify the certificate verification      settings for other connections      + Fix: Fix a potential crash when configuring raw certificates      + Fix: Avoid a potential crash with very long ALPN protocol      names      + Fix: Make the call to a CertificateVerifier more robust      + Fix: Avoid a potential crash when processing OCSP URLs      + Fix: Make the processing of OCSP responses more robust      + Fix: Stricter OCSP handling when soft-fail is disabled      + Fix: Harden against the mis-use of Buffer.address(ByteBuffer)      + Fix: Harden against the mis-use of Pool.destroy(long)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3167 advisory.

    Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user     to trigger a DoS via a JVM crash.

    This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier,     unsupported versions may also be affected.

    Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue. (CVE-2026-86243)

    Initialization of a resource with an insecure default vulnerability in Apache Tomcat Native enabled     insecure options by default  including ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET,     IGNORE_UNEXPECTED_EOF and ALLOW_NO_DHE_KEX.



    This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier     unsupported versions may also be affected.



    Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fix the issue. (CVE-2026-86246)

    Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate     verification requirements to be down-graded for some configurations.

    This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported     versions may also be affected.

    Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue. (CVE-2026-86247)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4546-1 advisory.

    Security issues fixed:

    libtcnative-1-0:

    - CVE-2026-86243: buffer overread during the TLS handshake permits a malicious user to trigger a DoS via a     JVM crash       (bsc#1282623).
    - CVE-2026-86246: insecure ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF     and       ALLOW_NO_DHE_KEX options enabled by default (bsc#1282622).
    - CVE-2026-86247: race condition allows client certificate verification requirements to be down-graded for     some       configurations (bsc#1282621).

    tomcat,tomcat10:

    - CVE-2026-73581: OpenSSL and OpenSSL-FFM TLS implementations ignore CRLs when certificate uses a keystore       (bsc#1282631).
    - CVE-2026-75973: improper authentication when Jakarta authentication is configured with     `SimpleAuthConfigProvider`       (bsc#1282630).
    - CVE-2026-76183: security constraints for any WebSocket endpoint can be bypassed (bsc#1282629).
    - CVE-2026-77756: inconsistent interpretation of HTTP requests allows an attacker to cause one request     from another user       to fail when Tomcat is located behind a reverse proxy (bsc#1282628).
    - CVE-2026-77762: stale HPACK emitter injects trailers fields into another HTTP/2 request (bsc#1282599).
    - CVE-2026-77791: uncontrolled resource consumption when sending WebSocket close message enabled a DoS     attack       (bsc#1282627).
    - CVE-2026-78383: allocation of resources without limits or throttling allows an unauthenticated AJP     request to pin an       AJP processing thread leading to denial of service (bsc#1282626).
    - CVE-2026-78437: incomplete cleanup allows a malformed request to potentially cause requests from another     user to fail       (bsc#1282625).
    - CVE-2026-79677: missing release of resource after effective lifetime and comparison using wrong factors     allows for       denial of service due to lost time outs for asynchronous WebSocket writes (bsc#1282624).
    - CVE-2026-86248: CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail     is disabled       (bsc#1282620).
    - CVE-2026-86350: HTTP/2 requests can cause request header mix-ups and HTTP request smuggling     (bsc#1282787).
    - CVE-2026-87022: WebSocket message smuggling when per-message-deflate is used (bsc#1282581).

    Changes for libtcnative-1-0:

    - Update to 1.3.9
     * Security fixes      + Client certificate requirements can be down-graded      (bsc#1282621, CVE-2026-86247)      A race condition allowed client certificate verification      requirements to be down-graded for some configurations.
     + Insecure OpenSSL options enabled (bsc#1282622, CVE-2026-86246)      Apache Tomcat Native enabled insecure options by default      including ALLOW_CLIENT_RENEGOTIATION,      NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF and      ALLOW_NO_DHE_KEX.
     + DoS via TLS handshake (bsc#1282623, CVE-2026-86243)      A buffer over-read vulnerability in Apache Tomcat Native      during the TLS handshaking permits a malicious user to trigger      a DoS via a JVM crash.
     * Changes      + Code: Remove call to ERR_remove_thread_state() from Windows      specific code to allow building with OpenSSL 4.0.x.
     ERR_remove_thread_state() is a no-op in OpenSSL 1.1+ and got      removed in OpenSSL 4      + Fix: Fix a potential crash when negotiating ALPN      + If ALPN negotiation fails and failure is configured to use      the last server protocol in the list, use it rather than the      last protocol offered by the client      + Fix: Add support for the extended range of options available      from OpenSSL 3.0.x. The options flag is now a 64-bit unsigned      int (represented by a Java long) rather than a 32-bit unsigned      int (represented by a Java int)      + Code: Remove unused code      + Ensure that per connection changes to certificate verification      settings, e.g. to support client certificate authentication,      do not modify the certificate verification settings for other      connections      + Fix: Fix a potential crash when configuring raw certificates      + Fix: Avoid a potential crash with very long ALPN protocol      names      + Fix: Make the call to a CertificateVerifier more robust      + Fix: Avoid a potential crash when processing OCSP URLs      + Fix: Make the processing of OCSP responses more robust      + Fix: Stricter OCSP handling when soft-fail is disabled      + Fix: Harden against the mis-use of Buffer.address(ByteBuffer)      + Fix: Harden against the mis-use of Pool.destroy(long)      + Code: The minimum supported OpenSSL version is now 3.0.x.
     OpenSSL 1.1.1 support was accidentally broken in 1.3.8. As no      bug reports were receive for that failure and since both      Debian and Ubuntu versions that used OpenSSL 1.1.1 have      reached end of support, OpenSSL 1.1.1 is no longer supported      + Update: OpenSSL 3.0.x is approaching end of support so the      recommended version of OpenSSL (and the version that windows      binaries will be built with) now follows the 3.5.x LTS branch      + Fix: Switch to automatic configuration of DH parameters.
     Manual configuration attempts will be ignored      + Code: Make setTmpECDHByCurveName() a NO-OP      + Fix: Refactor extraction of ECDH curve name from the      Certificate to avoid deprecated OpenSSL methods      + Fix: Refactor the native implementation of SSL.getTime() to      avoid the Y2038 problem in SSL_SESSION_get_time() when running      on a verion of OpenSSL that includes the new      SSL_SESSION_get_time_ex() method

    Changes for tomcat:

    - Update to Tomcat 9.0.122
     * Catalina      + Fix: Improve the handling of AsyncContext.dispatch() when the Context      attribute dispatchersUseEncodedPaths is set to false since the      application has no control over the path used for the      AsyncContext.dispatch(). Prior to this fix, paths containing literal '?'      characters were truncated. (markt)      + Fix: Ensure that capture groups from a RewriteCond always reflect the      result of the current request. (markt)      + Fix: When a PersistentManager needs to reduce the number of active      sessions, swap out the least recently used eligible sessions first. Pull      request #1045 provided by sainadh777. (markt)      + Fix: Align web.xml logging output with the new Context attribute      urlPatternsProvidedInDecodedForm. (markt)      + Fix: Improve robustness of DIGEST authentication to system clock jumps.
     (markt)      + Add: Support multiple protocol header values (treat as a single merged      header value) in the RemoteIpFilter and RemoteIpValve. (markt)      + Fix: potential concurrency issues when loading/saving sessions from/to a      session store. Custom Store implementations that do not extend StoreBase      must implement the new getSessionStoreLock() method of the Store      interface to ensure concurrency protection. The default method      implementation provided only provides the pre-fix functionality. (markt)      + Fix: Ensure that PersistentManager implementations that extend      PersistentManagerBase do not swap out sessions that are associated with      a request that is currently being processed. As a result, it is now a      requirement that the system property      org.apache.catalina.session.StandardSession.ACTIVITY_CHECK is set to      true (either explicitly or via STRICT_SERVLET_COMPLIANCE) if either      minIdleSwap or maxIdleSwap are configured. (markt)
     * Coyote      + Fix: xreflection generated code stack overflow issue. (remm)      + Fix: Align xreflection better with IntrospectionUtils. (remm)      + Fix: In HTTP/2 after half closed (remote), any unexpected frame should      be a stream error. (remm)      + Fix: incorrect initial window size calculation when upgrading to HTTP/2.
     (remm)      + Fix: Avoid HTTP/2 exceptions with invalid content-length values. (remm)      + Fix: Only try and load the native library from the CATALINA_HOME system      property when the property is set. (markt)      + Fix: max connections enforcement after an enpoint resume. (remm)      + Fix: Implement stricter ALPN matching for Connectors using FFM. (markt)      + Add: length validation for ALPN protocol names. (markt)      + Fix: Make FFM certificate verification more robust. (markt)      + Fix: Align FFM OCSP URL parsing with Tomcat Native and treat a parsing      failure as if no usable OCSP URLs were present. (markt)      + Fix: Make the processing of OCSP responses more robust. (markt)      + Fix: Stricter OCSP handling when soft-fail is disabled. (markt)      + Fix: Cleaner handling of AJP response headers which overflow the maximum      message size. (remm)      + Fix: Small per performance optimisation. Don't waste cycles swallowing      an AJP response body when the connection is going to be closed. (markt)      + Fix: OpenSSL support for CRLs when using OpenSSL trust with the server      key held in a Java key store. (markt)      + Fix: Reject HTTP/1.0 or earlier requests that send a transfer-encoding      header. (markt)      + Fix: Ensure per request HTTP/2 bad request marker is cleared when the      request is recycled. (markt)      + Fix: Additional clean-up after HTTP/2 stream reset to aid GC. (markt)      + Fix: Revert earlier refactoring of HTTP/2 header field validation that      moved it earlier since the refactoring made correct handling of invalid      headers more difficult. (markt)
     * Jasper      + Fix: EL evaluation of some lambda expressions. (remm)
     * WebSocket      + Fix: an exception when an automatic Pong response races with the closing      of the WebSocket session. (moritzfl)      + Fix: Harden the WebSocket client and use a SecureRandom when generating      the Sec-WebSocket-Key header. (markt)      + Fix: Improve robustness of client handshakes. (remm)      + Fix: Ensure that WebSocket write timeouts apply to the complete message      and are not lost if two writes have the same timeout. (markt)      + Fix: Reduce CPU usage while sending WebSocket close message. (markt)      + Fix: overly broad check that prevented request URIs containing literal {      and } characters from being mapped to WebSocket end points. (markt)      + Fix: handling of WebSocket messages with compressed payloads using per-      message-deflate that have one or more non-final blocks where the BFINAL      bit is set. (markt)      + Fix: handling of per-message-deflate context takeover when receiving      compressed WebSocket messages. (markt)
     * Web applications      + Fix: Manager: Fix a potential concurrency issue when ordering sessions      prior to displaying a list of session. (markt)      + Docs: Wrap the RewriteRule regular expression syntax reference on narrow      displays. Pull request #1044 by sainadh777. (markt)
     * Other      + Update: Easymock to 5.7.0. (markt)      + Update: bnd to 7.4.0. (markt)      + Update: Tomcat Native to 1.3.9. (markt)      + Add: Improvements to French translations. (remm)      + Add: Improvements to Japanese translations provided by tak7iji and      Ktamura.biz.80. (markt)
     * Cluster      + Fix: Validate that the DeltaManager attribute sendAllSessionsSize is a      positive integer. Zero or negative values previously caused an infinite      loop or a NegativeArraySizeException during session state transfer. Pull      request #1042 provided by lihongyi87. (markt)      + Fix: Improve robustness of cloud membership providers if an error occurs      fetching members. (remm)
     * jdbc-pool      + Fix: DataSourceProxy.getPooledConnection(String,String) now delegates to      getConnection(String,String) rather than getConnection(). (markt)      + Add: Log a warning if an attempt is made to obtain a connection with      credentials when alternateUsernameAllowed is set to false. (markt)      + Fix: Ensure StatementCache interceptor resets properties of cached      statements between uses. (mark)

    Changes for tomcat10:

    - Update to Tomcat 10.1.60
     * Catalina      + Fix: When a PersistentManager needs to reduce the number of active      sessions, swap out the least recently used eligible sessions first. Pull      request #1045 provided by sainadh777. (markt)      + Fix: Align web.xml logging output with the new Context attribute      urlPatternsProvidedInDecodedForm. (markt)      + Fix: Improve robustness of DIGEST authentication to system clock jumps.
     (markt)      + Add: Support multiple protocol header values (treat as a single merged      header value) in the RemoteIpFilter and RemoteIpValve. (markt)      + Fix: potential concurrency issues when loading/saving sessions from/to a      session store. Custom Store implementations that do not extend StoreBase      must implement the new getSessionStoreLock() method of the Store      interface to ensure concurrency protection. The default method      implementation provided only provides the pre-fix functionality. (markt)      + Fix: Ensure that PersistentManager implementations that extend      PersistentManagerBase do not swap out sessions that are associated with      a request that is currently being processed. This includes not swapping      out a session unless the session was created when activity tracking was      enabled. (markt)      + Fix: Ensure namespace attributes are XML escaped in WebDAV responses.
     + Fix: Resolve null or missing rewrite substitutions as an empty string,      to align with the mod_rewrite behavior. (remm)      + Add: a best efforts protection in the CrawlerSessionManagerValve against      crawlers being associated with an authenticated session. (markt)      + Fix: Clarify the meaning of various RewriteValve server variables and      explicitly use the canonical context path for the CONTEXT_PATH server      variable. (markt)      + Fix: storeconfig not saving the path when a context is saved in      server.xml. (remm)      + Fix: WAR URLConnection should propagate use of caching. (remm)      + Fix: Ensure resources are evicted from the static resource cache in the      correct order. (markt)      + Fix: When Jakarta Authentication is configured for a web application,      cache the ServerAuthConfig in the Authenticator valve. This ensures web      application specific settings are cached on a per web application basis.
     + Fix: 70203: Fix RegistrationListener notifications in Jakarta      Authentication implementation. (markt)      + Fix: Handle CGI scripts that write excessively to stdout after setting      an HTTP error status code. (schultz)      + Fix: Require the request to the login action during FORM authentication      to be made using HTTP POST. (markt)      + Fix: 70208: Make URL encoding more robust. Based on pull request #1065      by Chenjp. (markt)
     * Coyote      + Fix: xreflection generated code stack overflow issue. (remm)      + Fix: Align xreflection better with IntrospectionUtils. (remm)      + Fix: In HTTP/2 after half closed (remote), any unexpected frame should      be a stream error. (remm)      + Fix: incorrect initial window size calculation when upgrading to HTTP/2.
     (remm)      + Fix: Avoid HTTP/2 exceptions with invalid content-length values. (remm)      + Fix: Only try and load the native library from the CATALINA_HOME system      property when the property is set. (markt)      + Fix: max connections enforcement after an enpoint resume. (remm)      + Fix: Implement stricter ALPN matching for Connectors using FFM. (markt)      + Add: length validation for ALPN protocol names. (markt)      + Fix: Make FFM certificate verification more robust. (markt)      + Fix: Align FFM OCSP URL parsing with Tomcat Native and treat a parsing      failure as if no usable OCSP URLs were present. (markt)      + Fix: Make the processing of OCSP responses more robust. (markt)      + Fix: Stricter OCSP handling when soft-fail is disabled. (markt)      + Fix: Cleaner handling of AJP response headers which overflow the maximum      message size. (remm)      + Fix: Small per performance optimisation. Don't waste cycles swallowing      an AJP response body when the connection is going to be closed. (markt)      + Fix: OpenSSL support for CRLs when using OpenSSL trust with the server      key held in a Java key store. (markt)      + Fix: Reject HTTP/1.0 or earlier requests that send a transfer-encoding      header. (markt)      + Fix: Ensure per request HTTP/2 bad request marker is cleared when the      request is recycled. (markt)      + Fix: Additional clean-up after HTTP/2 stream reset to aid GC. (markt)      + Fix: Revert earlier refactoring of HTTP/2 header field validation that      moved it earlier since the refactoring made correct handling of invalid      headers more difficult. (markt)
     * Jasper      + Fix: EL evaluation of some lambda expressions. (remm)
     * WebSocket      + Fix: an exception when an automatic Pong response races with the closing      of the WebSocket session. (moritzfl)      + Fix: Harden the WebSocket client and use a SecureRandom when generating      the Sec-WebSocket-Key header. (markt)      + Fix: Improve robustness of client handshakes. (remm)      + Fix: Ensure that WebSocket write timeouts apply to the complete message      and are not lost if two writes have the same timeout. (markt)      + Fix: Reduce CPU usage while sending WebSocket close message. (markt)      + Fix: overly broad check that prevented request URIs containing literal {      and } characters from being mapped to WebSocket end points. (markt)      + Fix: handling of WebSocket messages with compressed payloads using per-      message-deflate that have one or more non-final blocks where the BFINAL      bit is set. (markt)      + Fix: handling of per-message-deflate context takeover when receiving      compressed WebSocket messages. (markt)
     * Web applications      + Fix: Manager: Fix a potential concurrency issue when ordering sessions      prior to displaying a list of session. (markt)      + Docs: Wrap the RewriteRule regular expression syntax reference on narrow      displays. Pull request #1044 by sainadh777. (markt)
     * Other      + Update: Easymock to 5.7.0. (markt)      + Update: bnd to 7.4.0. (markt)      + Update: Tomcat Native to 2.0.16. (markt)      + Add: Improvements to French translations. (remm)      + Add: Improvements to Japanese translations provided by tak7iji and      Ktamura.biz.80. (markt)
     * Cluster      + Fix: Validate that the DeltaManager attribute sendAllSessionsSize is a      positive integer. Zero or negative values previously caused an infinite      loop or a NegativeArraySizeException during session state transfer. Pull      request #1042 provided by lihongyi87. (markt)      + Fix: Improve robustness of cloud membership providers if an error occurs      fetching members. (remm)
     * jdbc-pool      + Fix: DataSourceProxy.getPooledConnection(String,String) now delegates to      getConnection(String,String) rather than getConnection(). (markt)      + Add: Log a warning if an attempt is made to obtain a connection with      credentials when alternateUsernameAllowed is set to false. (markt)      + Fix: Ensure StatementCache interceptor resets properties of cached      statements between uses. (mark)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4544-1 advisory.

    Security issues fixed:

    libtcnative-1-0:

    - CVE-2026-86243: buffer overread during the TLS handshake permits a malicious user to trigger a DoS via a     JVM crash       (bsc#1282623).
    - CVE-2026-86246: insecure ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF     and       ALLOW_NO_DHE_KEX options enabled by default (bsc#1282622).
    - CVE-2026-86247: race condition allows client certificate verification requirements to be down-graded for     some       configurations (bsc#1282621).

    tomcat11:

    - CVE-2026-73581: OpenSSL and OpenSSL-FFM TLS implementations ignore CRLs when certificate uses a keystore       (bsc#1282631).
    - CVE-2026-75973: improper authentication when Jakarta authentication is configured with     `SimpleAuthConfigProvider`       (bsc#1282630).
    - CVE-2026-76183: security constraints for any WebSocket endpoint can be bypassed (bsc#1282629).
    - CVE-2026-77756: inconsistent interpretation of HTTP requests allows an attacker to cause one request     from another user       to fail when Tomcat is located behind a reverse proxy (bsc#1282628).
    - CVE-2026-77762: stale HPACK emitter injects trailers fields into another HTTP/2 request (bsc#1282599).
    - CVE-2026-77791: uncontrolled resource consumption when sending WebSocket close message enabled a DoS     attack       (bsc#1282627).
    - CVE-2026-78383: allocation of resources without limits or throttling allows an unauthenticated AJP     request to pin an       AJP processing thread leading to denial of service (bsc#1282626).
    - CVE-2026-78437: incomplete cleanup allows a malformed request to potentially cause requests from another     user to fail       (bsc#1282625).
    - CVE-2026-79677: missing release of resource after effective lifetime and comparison using wrong factors     allows for       denial of service due to lost time outs for asynchronous WebSocket writes (bsc#1282624).
    - CVE-2026-86248: CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail     is disabled       (bsc#1282620).
    - CVE-2026-86350: HTTP/2 requests can cause request header mix-ups and HTTP request smuggling     (bsc#1282787).
    - CVE-2026-87022: WebSocket message smuggling when per-message-deflate is used (bsc#1282581).

    Changes for libtcnative-1-0:

    - Update to 1.3.9
     * Security fixes      + Client certificate requirements can be down-graded      (bsc#1282621, CVE-2026-86247)      A race condition allowed client certificate verification      requirements to be down-graded for some configurations.
     + Insecure OpenSSL options enabled (bsc#1282622, CVE-2026-86246)      Apache Tomcat Native enabled insecure options by default      including ALLOW_CLIENT_RENEGOTIATION,      NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF and      ALLOW_NO_DHE_KEX.
     + DoS via TLS handshake (bsc#1282623, CVE-2026-86243)      A buffer over-read vulnerability in Apache Tomcat Native      during the TLS handshaking permits a malicious user to trigger      a DoS via a JVM crash.
     * Changes      + Code: Remove call to ERR_remove_thread_state() from Windows      specific code to allow building with OpenSSL 4.0.x.
     ERR_remove_thread_state() is a no-op in OpenSSL 1.1+ and got      removed in OpenSSL 4      + Fix: Fix a potential crash when negotiating ALPN      + If ALPN negotiation fails and failure is configured to use      the last server protocol in the list, use it rather than the      last protocol offered by the client      + Fix: Add support for the extended range of options available      from OpenSSL 3.0.x. The options flag is now a 64-bit unsigned      int (represented by a Java long) rather than a 32-bit unsigned      int (represented by a Java int)      + Code: Remove unused code      + Ensure that per connection changes to certificate verification      settings, e.g. to support client certificate authentication,      do not modify the certificate verification settings for other      connections      + Fix: Fix a potential crash when configuring raw certificates      + Fix: Avoid a potential crash with very long ALPN protocol      names      + Fix: Make the call to a CertificateVerifier more robust      + Fix: Avoid a potential crash when processing OCSP URLs      + Fix: Make the processing of OCSP responses more robust      + Fix: Stricter OCSP handling when soft-fail is disabled      + Fix: Harden against the mis-use of Buffer.address(ByteBuffer)      + Fix: Harden against the mis-use of Pool.destroy(long)      + Code: The minimum supported OpenSSL version is now 3.0.x.
     OpenSSL 1.1.1 support was accidentally broken in 1.3.8. As no      bug reports were receive for that failure and since both      Debian and Ubuntu versions that used OpenSSL 1.1.1 have      reached end of support, OpenSSL 1.1.1 is no longer supported      + Update: OpenSSL 3.0.x is approaching end of support so the      recommended version of OpenSSL (and the version that windows      binaries will be built with) now follows the 3.5.x LTS branch      + Fix: Switch to automatic configuration of DH parameters.
     Manual configuration attempts will be ignored      + Code: Make setTmpECDHByCurveName() a NO-OP      + Fix: Refactor extraction of ECDH curve name from the      Certificate to avoid deprecated OpenSSL methods      + Fix: Refactor the native implementation of SSL.getTime() to      avoid the Y2038 problem in SSL_SESSION_get_time() when running      on a verion of OpenSSL that includes the new      SSL_SESSION_get_time_ex() method

    Changes for tomcat11:

    - Update to Tomcat 11.0.26
     * Catalina      + Fix: Improve the handling of AsyncContext.dispatch() when the Context      attribute dispatchersUseEncodedPaths is set to false since the      application has no control over the path used for the      AsyncContext.dispatch(). Prior to this fix, paths containing literal '?'      characters were truncated. (markt)      + Fix: Ensure that capture groups from a RewriteCond always reflect the      result of the current request. (markt)      + Fix: When a PersistentManager needs to reduce the number of active      sessions, swap out the least recently used eligible sessions first. Pull      request #1045 provided by sainadh777. (markt)      + Fix: Align web.xml logging output with the new Context attribute      urlPatternsProvidedInDecodedForm. (markt)      + Fix: Improve robustness of DIGEST authentication to system clock jumps.
     (markt)      + Add: Support multiple protocol header values (treat as a single merged      header value) in the RemoteIpFilter and RemoteIpValve. (markt)      + Fix: potential concurrency issues when loading/saving sessions from/to a      session store. Custom Store implementations that do not extend StoreBase      must implement the new getSessionStoreLock() method of the Store      interface to ensure concurrency protection. The default method      implementation provided only provides the pre-fix functionality. (markt)      + Fix: Ensure that PersistentManager implementations that extend      PersistentManagerBase do not swap out sessions that are associated with      a request that is currently being processed. This includes not swapping      out a session unless the session was created when activity tracking was      enabled. (markt)      + Fix: Ensure namespace attributes are XML escaped in WebDAV responses.
     + Fix: Resolve null or missing rewrite substitutions as an empty string,      to align with the mod_rewrite behavior. (remm)      + Add: a best efforts protection in the CrawlerSessionManagerValve against      crawlers being associated with an authenticated session. (markt)      + Fix: Clarify the meaning of various RewriteValve server variables and      explicitly use the canonical context path for the CONTEXT_PATH server      variable. (markt)      + Fix: storeconfig not saving the path when a context is saved in      server.xml. (remm)      + Fix: WAR URLConnection should propagate use of caching. (remm)      + Fix: Ensure resources are evicted from the static resource cache in the      correct order. (markt)      + Fix: When Jakarta Authentication is configured for a web application,      cache the ServerAuthConfig in the Authenticator valve. This ensures web      application specific settings are cached on a per web application basis.
     + Fix: 70203: Fix RegistrationListener notifications in Jakarta      Authentication implementation. (markt)      + Fix: Handle CGI scripts that write excessively to stdout after setting      an HTTP error status code. (schultz)      + Fix: Require the request to the login action during FORM authentication      to be made using HTTP POST. (markt)      + Fix: 70208: Make URL encoding more robust. Based on pull request #1065      by Chenjp. (markt)
     * Coyote      + Fix: parsing of client certificates that specify more than one OCSP      responder for configurations that use OpenSSL-FFM. (markt)      + Fix: xreflection generated code stack overflow issue. (remm)      + Fix: Align xreflection better with IntrospectionUtils. (remm)      + Fix: In HTTP/2 after half closed (remote), any unexpected frame should      be a stream error. (remm)      + Fix: incorrect initial window size calculation when upgrading to HTTP/2.
     (remm)      + Fix: Avoid HTTP/2 exceptions with invalid content-length values. (remm)      + Fix: Only try and load the native library from the CATALINA_HOME system      property when the property is set. (markt)      + Fix: max connections enforcement after an enpoint resume. (remm)      + Fix: Implement stricter ALPN matching for Connectors using FFM. (markt)      + Add: length validation for ALPN protocol names. (markt)      + Fix: Make FFM certificate verification more robust. (markt)      + Fix: Align FFM OCSP URL parsing with Tomcat Native and treat a parsing      failure as if no usable OCSP URLs were present. (markt)      + Fix: Make the processing of OCSP responses more robust. (markt)      + Fix: Stricter OCSP handling when soft-fail is disabled. (markt)      + Fix: Cleaner handling of AJP response headers which overflow the maximum      message size. (remm)      + Fix: Small per performance optimisation. Don't waste cycles swallowing      an AJP response body when the connection is going to be closed. (markt)      + Fix: OpenSSL support for CRLs when using OpenSSL trust with the server      key held in a Java key store. (markt)      + Fix: Reject HTTP/1.0 or earlier requests that send a transfer-encoding      header. (markt)      + Fix: Ensure per request HTTP/2 bad request marker is cleared when the      request is recycled. (markt)      + Fix: Additional clean-up after HTTP/2 stream reset to aid GC. (markt)      + Fix: Revert earlier refactoring of HTTP/2 header field validation that      moved it earlier since the refactoring made correct handling of invalid      headers more difficult. (markt)
     * Jasper      + Fix: EL evaluation of some lambda expressions. (remm)
     * WebSocket      + Fix: an exception when an automatic Pong response races with the closing      of the WebSocket session. (moritzfl)      + Fix: Harden the WebSocket client and use a SecureRandom when generating      the Sec-WebSocket-Key header. (markt)      + Fix: Improve robustness of client handshakes. (remm)      + Fix: Ensure that WebSocket write timeouts apply to the complete message      and are not lost if two writes have the same timeout. (markt)      + Fix: Reduce CPU usage while sending WebSocket close message. (markt)      + Fix: overly broad check that prevented request URIs containing literal {      and } characters from being mapped to WebSocket end points. (markt)      + Fix: handling of WebSocket messages with compressed payloads using per-      message-deflate that have one or more non-final blocks where the BFINAL      bit is set. (markt)      + Fix: handling of per-message-deflate context takeover when receiving      compressed WebSocket messages. (markt)
     * Web applications      + Fix: Manager: Fix a potential concurrency issue when ordering sessions      prior to displaying a list of session. (markt)      + Docs: Wrap the RewriteRule regular expression syntax reference on narrow      displays. Pull request #1044 by sainadh777. (markt)
     * Other      + Update: Easymock to 5.7.0. (markt)      + Update: bnd to 7.4.0. (markt)      + Update: Tomcat Native to 2.0.16. (markt)      + Add: Improvements to French translations. (remm)      + Add: Improvements to Japanese translations provided by tak7iji and      Ktamura.biz.80. (markt)
     * Cluster      + Fix: Validate that the DeltaManager attribute sendAllSessionsSize is a      positive integer. Zero or negative values previously caused an infinite      loop or a NegativeArraySizeException during session state transfer. Pull      request #1042 provided by lihongyi87. (markt)      + Fix: Improve robustness of cloud membership providers if an error occurs      fetching members. (remm)
     * jdbc-pool      + Fix: DataSourceProxy.getPooledConnection(String,String) now delegates to      getConnection(String,String) rather than getConnection(). (markt)      + Add: Log a warning if an attempt is made to obtain a connection with      credentials when alternateUsernameAllowed is set to false. (markt)      + Fix: Ensure StatementCache interceptor resets properties of cached      statements between uses. (mark)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate     verification requirements to be down-graded for some configurations. This issue affects Apache Tomcat     Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected.
    Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue. (CVE-2026-86247)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
375539	RHEL 10 / 8 / 9 : Red Hat JBoss Web Server 7.0.3 (RHSA-2026:93618)	Nessus	Red Hat Local Security Checks	Local	critical
374094	SUSE SLES12: libapr1 / libapr1-devel / libtcnative-1-0 / libtcnative-1-0-devel / etc (SUSE-SU-2026:4927-1)	Nessus	SuSE Local Security Checks	Local	critical
371802	Amazon Linux 2 : tomcat-native (ALAS-2026-4016)	Nessus	Amazon Linux Local Security Checks	Local	high
477146	Alpine: multiple tomcat-native packages: security update to 2.0.16-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
477146	Alpine: multiple tomcat-native packages: security update to 2.0.16-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
366067	SUSE SLED15 / SLES15 Security Update : libtcnative-2-0 (SUSE-SU-2026:4658-1)	Nessus	SuSE Local Security Checks	Local	critical
365210	Amazon Linux 2023 : tomcat-native (ALAS2023-2026-3167)	Nessus	Amazon Linux Local Security Checks	Local	critical
363782	SUSE SLES15: libtcnative-1-0 / libtcnative-1-0-devel / tomcat / etc (SUSE-SU-2026:4546-1)	Nessus	SuSE Local Security Checks	Local	critical
363770	SUSE SLED15: libtcnative-1-0 / libtcnative-1-0-devel / tomcat11 / etc (SUSE-SU-2026:4544-1)	Nessus	SuSE Local Security Checks	Local	critical
363073	SUSE SLES16: libtcnative-1-0 / libtcnative-2-0 / tomcat / tomcat-admin-webapps / etc (SUSE-SU-2026:23985-1)	Nessus	SuSE Local Security Checks	Local	critical
362525	openSUSE 16: libtcnative-1-0 / libtcnative-1-0-devel / libtcnative-2-0 / etc (openSUSE-SU-2026:21984-1)	Nessus	SuSE Local Security Checks	Local	critical
349581	Linux Distros Unpatched Vulnerability : CVE-2026-86247	Nessus	Misc.	Local	high

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CVE-2026-86247

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