In Bouncy Castle for Java before 1.86, the streaming CMS AuthenticatedData parser accepted a message whose digestAlgorithm and authAttrs fields disagreed about whether authenticated attributes were present. RFC 5652 sec. 9.1 pairs the two, requiring that authAttrs be present whenever digestAlgorithm is, and sec. 9.2 makes the MAC cover the DER encoding of authAttrs when they are present and the eContent OCTET STRING directly when they are not. CMSAuthenticatedDataParser has to choose between those two in its constructor, before it can reach authAttrs, which comes later in the SEQUENCE, so it chose on digestAlgorithm alone: for a message with digestAlgorithm absent but authAttrs present it verified the content MAC and then returned the attributes through getAuthAttrs() as though they had been authenticated, when the MAC had never covered them. An attacker able to modify a message in transit could insert an authenticated attribute, such as an RFC 2634 ESSSecurityLabel, into an otherwise valid message while holding neither the key-encryption key nor the content-MAC key, and an application taking an authorization, routing or labelling decision from those attributes would act on attacker-chosen values. The content itself remained MAC-bound. asn1.cms.AuthenticatedData now rejects the mismatched pairing when parsing and CMSAuthenticatedDataParser cross-checks the two fields once authAttrs is read. This is a variant of CVE-2026-59642, which bound the content to the MAC for messages that legitimately carry authAttrs, and which does not address this case. This issue also affects Bouncy Castle for Java LTS before 2.73.13, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series), and bcutil-fips 2.0.8 (2.0.X series) and 2.1.8 (2.1.X series).

atlassian_confluence CONFSERVER-104423: DoS (Denial of Service) io.netty:netty-codec-http Dependency in Confluence Data Center

atlassian_confluence CONFSERVER-104397: Broken Authentication & Session Management org.bouncycastle:bcpkix-lts8on Dependency in Confluence Data Center

atlassian_confluence CONFSERVER-104419: DoS (Denial of Service) io.netty:netty-codec Dependency in Confluence Data Center

atlassian_jira_service_management JSDSERVER-16728: DoS (Denial of Service) io.netty:netty-codec Dependency in Jira Service Management Data Center

atlassian_jira_service_management JSDSERVER-16756: RCE (Remote Code Execution) org.bouncycastle:bcprov-lts8on Dependency in Jira Service Management Data Center

atlassian_confluence CONFSERVER-104437: RCE (Remote Code Execution) org.bouncycastle:bcprov-lts8on Dependency in Confluence Data Center

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:22169-1 advisory.

    Update to 1.86:

    - CVE-2026-17507: negative signed leaf_index values from unsigned wire encodings can cause heap exhaustion       (bsc#1284075).
    - CVE-2026-17508: unbounded KDF iteration and memory parameters can cause resource exhaustion     (bsc#1284073).
    - CVE-2026-18036: variable-time modulo and division operations in NTRU implementation can allow timing     side-channel       attacks (bsc#1284065).
    - CVE-2026-18040: table lookups and variable-time duplicate scanning in HQC can cause cache side-channel     leaks       (bsc#1284205).
    - CVE-2026-71885: unbound X.509 certificates in MLS LeafNode verification can cause identity impersonation     and group       message interception (bsc#1284165).
    - CVE-2026-71886: unvalidated CERTIFY_OTHER flags in OpenPGP subkeys can cause unauthorized trust     delegations and       identity spoofing (bsc#1284212).
    - CVE-2026-71887: missing primary key back-signature validation on subkeys can cause signature     misattribution and trust       context spoofing (bsc#1284213).
    - CVE-2026-71888: disagreement between digestAlgorithm and authAttrs in CMS parsing can cause     unauthenticated attribute       injection (bsc#1284215).
    - CVE-2026-71889: skipped leaf certificate evaluation in checkNameConstraints can cause X.509 name     constraint bypasses       (bsc#1284218).
    - CVE-2026-71890: unbounded Remove proposals in external MLS commits can cause arbitrary group member     eviction and       session takeover (bsc#1284219).
    - CVE-2026-71891: forged ECPoint curves in BLS12-381 key validation can cause aggregate signature     verification bypasses       (bsc#1284220).
    - CVE-2026-71892: type mismatch in CMS key-transport validation can cause key-size enforcement bypasses     for HKDF-derived       content keys (bsc#1284221).
    - CVE-2026-85515: laundered EOF exceptions in OpenPGP message stream processing can cause unregistered     truncation errors       and integrity check bypasses (bsc#1284222).
    - CVE-2026-97873: unbounded iteration counts in legacy PBES1 and PKCS#12 PBE implementations can cause     resource       exhaustion (bsc#1284224).

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-2026:4797-1 advisory.

    - CVE-2026-17507: negative signed leaf_index values from unsigned wire encodings can cause heap exhaustion       (bsc#1284075).
    - CVE-2026-17508: unbounded KDF iteration and memory parameters can cause resource exhaustion     (bsc#1284073).
    - CVE-2026-18036: variable-time modulo and division operations in NTRU implementation can allow timing     side-channel       attacks (bsc#1284065).
    - CVE-2026-18040: table lookups and variable-time duplicate scanning in HQC can cause cache side-channel     leaks       (bsc#1284205).
    - CVE-2026-71885: unbound X.509 certificates in MLS LeafNode verification can cause identity impersonation     and group       message interception (bsc#1284165).
    - CVE-2026-71886: unvalidated CERTIFY_OTHER flags in OpenPGP subkeys can cause unauthorized trust     delegations and       identity spoofing (bsc#1284212).
    - CVE-2026-71887: missing primary key back-signature validation on subkeys can cause signature     misattribution and trust       context spoofing (bsc#1284213).
    - CVE-2026-71888: disagreement between digestAlgorithm and authAttrs in CMS parsing can cause     unauthenticated attribute       injection (bsc#1284215).
    - CVE-2026-71889: skipped leaf certificate evaluation in checkNameConstraints can cause X.509 name     constraint bypasses       (bsc#1284218).
    - CVE-2026-71890: unbounded Remove proposals in external MLS commits can cause arbitrary group member     eviction and       session takeover (bsc#1284219).
    - CVE-2026-71891: forged ECPoint curves in BLS12-381 key validation can cause aggregate signature     verification bypasses       (bsc#1284220).
    - CVE-2026-71892: type mismatch in CMS key-transport validation can cause key-size enforcement bypasses     for HKDF-derived       content keys (bsc#1284221).
    - CVE-2026-85515: laundered EOF exceptions in OpenPGP message stream processing can cause unregistered     truncation errors       and integrity check bypasses (bsc#1284222).
    - CVE-2026-97873: unbounded iteration counts in legacy PBES1 and PKCS#12 PBE implementations can cause     resource       exhaustion (bsc#1284224).

    Changes for bouncycastle:

    - Updated to version 1.86.

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.

  - In Bouncy Castle for Java before 1.86, the streaming CMS AuthenticatedData parser accepted a message whose     digestAlgorithm and authAttrs fields disagreed about whether authenticated attributes were present. RFC     5652 sec. 9.1 pairs the two, requiring that authAttrs be present whenever digestAlgorithm is, and sec. 9.2     makes the MAC cover the DER encoding of authAttrs when they are present and the eContent OCTET STRING     directly when they are not. CMSAuthenticatedDataParser has to choose between those two in its constructor,     before it can reach authAttrs, which comes later in the SEQUENCE, so it chose on digestAlgorithm alone:
    for a message with digestAlgorithm absent but authAttrs present it verified the content MAC and then     returned the attributes through getAuthAttrs() as though they had been authenticated, when the MAC had     never covered them. An attacker able to modify a message in transit could insert an authenticated     attribute, such as an RFC 2634 ESSSecurityLabel, into an otherwise valid message while holding neither the     key-encryption key nor the content-MAC key, and an application taking an authorization, routing or     labelling decision from those attributes would act on attacker-chosen values. The content itself remained     MAC-bound. asn1.cms.AuthenticatedData now rejects the mismatched pairing when parsing and     CMSAuthenticatedDataParser cross-checks the two fields once authAttrs is read. This is a variant of     CVE-2026-59642, which bound the content to the MAC for messages that legitimately carry authAttrs, and     which does not address this case. This issue also affects Bouncy Castle for Java LTS before 2.73.13, and     Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and     2.1.13 (2.1.X series), and bcutil-fips 2.0.8 (2.0.X series) and 2.1.8 (2.1.X series). (CVE-2026-71888)

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

ID	Name	Product	Family	Type	Severity
374747	openSUSE 16: bouncycastle / bouncycastle-javadoc / bouncycastle-jmail / etc (openSUSE-SU-2026:22169-1)	Nessus	SuSE Local Security Checks	Local	critical
370393	SUSE SLED15: bouncycastle / bouncycastle-pg / bouncycastle-pkix / etc (SUSE-SU-2026:4797-1)	Nessus	SuSE Local Security Checks	Local	critical
362874	Linux Distros Unpatched Vulnerability : CVE-2026-71888	Nessus	Misc.	Local	high

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