Netty is a network application framework for development of protocol servers and clients. In netty-codec-http2 prior to versions 4.1.135.Final and 4.2.15.Final, the `DelegatingDecompressorFrameListener` class orchestrates HTTP/2 decompression by embedding a per-stream `EmbeddedChannel` that runs the appropriate decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each decompressed chunk is a pooled `ByteBuf` handed to an anonymous `ChannelInboundHandlerAdapter` tail handler, which becomes the sole owner responsible for releasing it. A remote peer could send frames that would result in the flow-controller throwing and so trigger a resource leak which at the end might take down the whole JVM due OOME. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:53644 advisory.

    Red Hat JBoss Enterprise Application Platform 7 is a platform for Java applications based on the WildFly     application runtime. This release of Red Hat JBoss Enterprise Application Platform 7.4.25 serves as a     replacement for Red Hat JBoss Enterprise Application Platform 7.4.24, and includes bug fixes and     enhancements. See the Red Hat JBoss Enterprise Application Platform 7.4.25 Release Notes for information     about the most significant bug fixes and enhancements included in this release.

    Security Fix(es):

    * netty-codec-redis: Netty: Denial of Service via malicious Redis array header (CVE-2026-50011)

    * netty-handler: Netty: Denial of Service due to eager buffer allocation in TLS handshake (CVE-2026-45416)

    * netty-codec-redis: netty-codec-redis: Denial of Service via crafted Redis payload with deeply nested     arrays (CVE-2026-44250)

    * netty-codec-redis: netty-codec-redis: Denial of Service via crafted Redis payloads (CVE-2026-44890)

    * netty-transport-sctp: Netty-transport-sctp: Denial of Service due to unbounded memory growth from     SctpMessage fragments (CVE-2026-46340)

    * netty-resolver-dns: Netty: Information disclosure and data manipulation due to improper CNAME record     validation (CVE-2026-45674)

    * netty-handler: Netty: Improper trust manager handling leads to hostname verification bypass     (CVE-2026-50010)

    * netty-codec-redis: Netty's Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in     RedisArrayAggregator (CVE-2026-48006)

    * netty-resolver-dns: Netty has Insufficient Bailiwick Validation for NS Records (CVE-2026-47691)

    * netty-codec-haproxy: Netty HAProxy PROXY protocol v2 codec: Denial of Service via memory leak from     crafted PROXY protocol headers (CVE-2026-48059)

    * netty-codec-http2: netty-codec-http2: Denial of Service due to resource leak (CVE-2026-48043)

    * netty-codec-haproxy: Netty-codec-haproxy: Denial of Service via malformed HAProxy message     (CVE-2026-44893)

    * netty-codec-http: Netty: Request smuggling via malformed Transfer-Encoding parsing (CVE-2026-42585)

    * netty-codec-http2: Netty: Denial of Service via unbounded memory allocation in HTTP content     decompression (CVE-2026-42587)

    * netty-codec-http: Netty: Denial of Service via unbounded memory allocation in HTTP content decompression     (CVE-2026-42587)

    * netty-codec-http: Netty: HTTP request smuggling via URI manipulation and CRLF injection (CVE-2026-41417)

    * netty-handler-proxy: Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation     (CVE-2026-42578)

    * netty-codec-http: Netty: HTTP Request Smuggling due to improper handling of conflicting HTTP/1.0 headers     (CVE-2026-42581)

    * netty-codec-http: Netty: Incorrect HTTP response parsing leads to data confusion (CVE-2026-42584)

    * netty-codec-dns: Netty: High integrity impact due to improper DNS domain name constraint enforcement     (CVE-2026-42579)

    * picketlink-federation: auth bypass in Picketlink SAML unsolicited-response (CVE-2026-10579)

    * bcprov-jdk18on: LDAP injection vulnerability in LDAPStoreHelper.java (CVE-2026-0636)

    * bcprov-jdk15on: LDAP injection vulnerability in LDAPStoreHelper.java (CVE-2026-0636)

    * bcprov-jdk15: LDAP injection vulnerability in LDAPStoreHelper.java (CVE-2026-0636)

    * bcprov-jdk12: LDAP injection vulnerability in LDAPStoreHelper.java (CVE-2026-0636)

    * bcpg-jdk18on: unbounded PGP AEAD chunk size leads to pre-auth resource exhaustion (CVE-2026-3505)

    * bcpg-jdk15on: unbounded PGP AEAD chunk size leads to pre-auth resource exhaustion (CVE-2026-3505)

    * bcpkix-jdk18on: PKIX draft CompositeVerifier accepts empty signature sequence as valid (CVE-2026-5588)

    * bcpkix-jdk15on: PKIX draft CompositeVerifier accepts empty signature sequence as valid (CVE-2026-5588)

    * bcprov-jdk18on: GOSTCTR implementation unable to process more than 255 blocks correctly (CVE-2025-14813)

    * bcprov-jdk15on: GOSTCTR implementation unable to process more than 255 blocks correctly (CVE-2025-14813)

    * bcprov-jdk15: GOSTCTR implementation unable to process more than 255 blocks correctly (CVE-2025-14813)

    * bcprov-jdk12: GOSTCTR implementation unable to process more than 255 blocks correctly (CVE-2025-14813)

    * bcprov-jdk15: private key leakage via non-constant time comparisons (CVE-2026-5598)

    * bcprov-jdk12: private key leakage via non-constant time comparisons (CVE-2026-5598)

    * artemis-server: Apache Artemis, Apache ActiveMQ Artemis: Message injection and exfiltration due to     missing authentication (CVE-2026-27446)

    * undertow-core: Undertow: Authentication Bypass via AJP ssl_cert/is_ssl Forgery (CVE-2026-15554)

    * wildfly-clustering-infinispan-marshalling: Jboss Deserialization RCE via Unfiltered River Unmarshaller     (CVE-2026-15555)

    * picketlink-federation: picketlink SAML 2.0 auth bypass via missing assertions (CVE-2026-15556)

    * openjdk-orb: unauthed class loading via IIOP in EAP (CVE-2026-15560)

    * undertow-core: OOM via missing limits in chunked trailer in EAP's Undertow (CVE-2026-15561)

    * jboss-remoting: jboss-remoting: integer overflow in MessageReader leads to pre-authentication denial of     service (CVE-2026-15562)

    * wildfly-iiop-openjdk: Missing authentication on EAP's IIOP NameService leads to MITM or DoS     (CVE-2026-15563)

    * jsf-impl: mojarra: Unauthenticated RCE in EAP JSF applications via EL injection in ui:include     (CVE-2026-46581)

    * netty-handler: netty-handler: IPv6 subnet rule bypass due to incorrect masking operation     (CVE-2026-44249)

    * jackson-core: Denial of Service via incomplete fix in async JSON parser (CVE-2026-68494)

    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 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-2026:2802-1 advisory.

    This update for netty, netty-tcnative fixes the following issue

    This update for netty, netty-tcnative fixes the following issues

    Upgrade netty to upstream version 4.1.135, netty-tcnative to upstream version 2.0.79:

    - CVE-2026-44249: IPv6 Subnet Filter Bypass via Incorrect Comparator Masking (bsc#1268165).
    - CVE-2026-44250: Memory Exhaustion in RedisArrayAggregator due to Deeply Nested Arrays (bsc#1268169).
    - CVE-2026-44890: Unbounded Direct Memory Consumption in RedisDecoder (bsc#1268170).
    - CVE-2026-44893: netty-codec-haproxy: Denial of Service via malformed HAProxy message (bsc#1268244).
    - CVE-2026-45416: SNI handler pre-allocates up to 16 MiB from nine attacker bytes (bsc#1268246).
    - CVE-2026-45536: Unix-socket fd receive leaks descriptors when peer sends two at once (bsc#1268247).
    - CVE-2026-45673: netty-resolver-dns: DNS Cache Poisoning via predictable transaction IDs (bsc#1268248).
    - CVE-2026-45674: DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records (bsc#1268249).
    - CVE-2026-46340: netty-transport-sctp: Denial of Service due to unbounded memory growth from SctpMessage     fragments       (bsc#1268250).
    - CVE-2026-47244: HTTP/2: Advertised MAX_CONCURRENT_STREAMS not enforced (bsc#1268251).
    - CVE-2026-47691: Insufficient Bailiwick Validation for NS Records (bsc#1268252).
    - CVE-2026-48006: netty-codec-redis: Netty's Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in       RedisArrayAggregator (bsc#1268255).
    - CVE-2026-48043: netty-codec-http2: Denial of Service due to resource leak (bsc#1268257).
    - CVE-2026-48059: netty-codec-haproxy: Denial of Service via memory leak from crafted PROXY protocol     headers       (bsc#1268258).
    - CVE-2026-50010: Wrapping plain trust manager silently disables hostname verification (bsc#1268259).
    - CVE-2026-50011: Unbounded pre-allocation in RedisArrayAggregator from RESP array length (bsc#1268260).
    - CVE-2026-50020: HttpObjectDecoder skips arbitrary initial control characters when only initial CRLF     characters are       permitted (bsc#1268261).
    - CVE-2026-50560: Netty susceptible to HTTP/2 Reset Attack with different on-the-wire signature     (bsc#1268262).

    Changes:

     - MQTT: Allow MQTT 5 CONNECT with password only      + ChannelInitializer: correct misleading comment on      exceptionCaught route      + HTTP/2: Parse request-target path like Vert.x (4.1 backport)      + HttpObjectDecoder skips arbitrary initial control characters      when only initial CRLF characters are permitted      + IpSubnetFilter: Correctly handle ipv6      + Configurable bound on RedisArrayAggregator      + Redis: Limit decoded length      + DNS: Ensure query id is not predictible      + Wrapping plain trust manager silently disables hostname      verification      + MQTT: Reject malformed no-payload packets with non-zero      Remaining Length      + HAProxy: Reject HAProxyMessages with malformated TLV and not      leak memory      + SSL: Use sane defaults as limits for the client hello length      and timeout      + DNS: Only cache CNAME if part of the queried domain      + HTTP/2: Enforce max concurrent streams for misbehaving clients      + Dns: Insufficient Bailiwick Validation for NS Records      + HTTP2: DelegatingDecompressorFrameListener must release memory      in all cases      + Pass maxAllocation to Brotli and Zstd decoders      + HTTP/2: Treat clients MAX_HEADER_LIST_SIZE as advisory      + Add maxWindowLog parameter to ZstdDecoder to bound memory      allocation      + HAProxy: Fix ByteBuf leak when parsing nested SSL TLVs      + Epoll / Kqueue: Correctly handle receive of FD      + SCTP: Limit the number of inflight incomplete SCTP messages      and the number of fragments      + Redis: Correctly release incomplete message on removal when      using RedisArrayAggregator      + Redis: Limit the maximum number of nested arrays      + HTTP: Re-add constructor to HttpProxyHandler that was removed      by mistake      + Marshalling: Explicit document security requirements      + Pin HTTP/RTSP version + method normalization to Locale.US      + Adaptive: Fix concurrency issue in adaptive allocator      + Pin multipart Content-Type / Content-Transfer-Encoding case      folding to Locale.US      + Remove dead native declarations      + Avoid re-parsing openssl key material with non-cached provider      + IpFilter: Fix ClassCastException caused by IpSubnetFilter if      only ipv6 rules are configured but remote peer is using ipv4      + Resolve all localhost addresses without querying DNS servers      + HTTP2: Use 100 as default max concurrent streams setting      + Route synchronous onLookupComplete exceptions via      fireExceptionCaught      + Fix MQTT decoder size check after variable header replay

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.

  - Netty is a network application framework for development of protocol servers and clients. In netty-codec-     http2 prior to versions 4.1.135.Final and 4.2.15.Final, the `DelegatingDecompressorFrameListener` class     orchestrates HTTP/2 decompression by embedding a per-stream `EmbeddedChannel` that runs the appropriate     decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each     decompressed chunk is a pooled `ByteBuf` handed to an anonymous `ChannelInboundHandlerAdapter` tail     handler, which becomes the sole owner responsible for releasing it. A remote peer could send frames that     would result in the flow-controller throwing and so trigger a resource leak which at the end might take     down the whole JVM due OOME. Versions 4.1.135.Final and 4.2.15.Final patch the issue. (CVE-2026-48043)

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Netty is a network application framework for development of protocol servers and clients. In netty-codec-
    http2 prior to versions 4.1.135.Final and 4.2.15.Final, the `DelegatingDecompressorFrameListener` class
    orchestrates HTTP/2 decompression by embedding a per-stream `EmbeddedChannel` that runs the appropriate
    decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each
    decompressed chunk is a pooled `ByteBuf` handed to an anonymous `ChannelInboundHandlerAdapter` tail
    handler, which becomes the sole owner responsible for releasing it. A remote peer could send frames that
    would result in the flow-controller throwing and so trigger a resource leak which at the end might take
    down the whole JVM due OOME. Versions 4.1.135.Final and 4.2.15.Final patch the issue. (CVE-2026-48043)

ID	Name	Product	Family	Type	Severity
334631	RHEL 7 : Red Hat JBoss Enterprise Application Platform 7.4.25 security pdate (Important) (RHSA-2026:53644)	Nessus	Red Hat Local Security Checks	Local	critical
326003	SUSE SLED15 / SLES15 Security Update : netty, netty-tcnative (SUSE-SU-2026:2802-1)	Nessus	SuSE Local Security Checks	Local	high
320927	Linux Distros Unpatched Vulnerability : CVE-2026-48043	Nessus	Misc.	Local	high
443079	SCA: security update for io.netty:netty-codec-http2 (GHSA-c2gf-v879-257j)	Tenable Cloud Security	SCA Checks	Local	high
443079	SCA: security update for io.netty:netty-codec-http2 (GHSA-c2gf-v879-257j)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-48043

high

Tenable Plugins

critical

high

high

high

high