Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's STOMP encoder ( StompSubframeEncoder ) does not escape or validate header values in CONNECT and CONNECTED frames, so raw newline ( \n ) characters in a header value are written directly to the wire, allowing an attacker who controls a header value to inject additional STOMP headers. This happens because the encoder intentionally skips escaping for CONNECT/CONNECTED frames per the STOMP 1.2 specification but never rejects the raw newlines, and since a broker parses each line as a separate header, an attacker controlling a value such as a user-supplied login or passcode can overwrite connection parameters or add authentication/role headers to bypass authentication or escalate privileges (the actual impact is broker-dependent). The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

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-2026:3482-1 advisory.

    Upgrade netty to upstream version 4.1.136 and netty-tcnative to version 2.0.80 Final.

    Security issues fixed

    - CVE-2026-44891: memory exhaustion in `io.netty:netty-codec-stomp` (bsc#1271435).
    - CVE-2026-55831: resource exhaustion/DoS in `io.netty:netty-codec-http` (bsc#1271960).
    - CVE-2026-55833: zip bomb in `io.netty:netty-codec-http` (bsc#1271961).
    - CVE-2026-55851: memory exhaustion in `io.netty:netty-codec-haproxy` (bsc#1272253).
    - CVE-2026-56745: memory exhaustion in `io.netty:netty-codec-http` (bsc#1272254).
    - CVE-2026-56746: improper access control in `io.netty:netty-codec-http` (CORS) (bsc#1272255).
    - CVE-2026-56817: insecure defaults in XML parsing in `io.netty:netty-codec-xml` (bsc#1272257).
    - CVE-2026-56818: memory leak in `io.netty:netty-codec-redis` (bsc#1272603).
    - CVE-2026-56819: memory leak in `io.netty:netty-codec-http2` (bsc#1272258).
    - CVE-2026-56820: improper certificate validation in `io.netty:netty-handler-ssl-ocsp` (bsc#1272259).
    - CVE-2026-56821: improper certificate revocation check in `io.netty:netty-handler-ssl-ocsp`     (bsc#1272299).
    - CVE-2026-56822: time-of-check/time-of-use in `io.netty:netty-handler-ssl-ocsp` (bsc#1272300).
    - CVE-2026-59898: protocol version confusion in `io.netty:netty-codec-http` (websocket) (bsc#1272302).
    - CVE-2026-59899: memory exhaustion in `io.netty:netty-codec-http` (bsc#1272301).
    - CVE-2026-59900: improper header neutralization in `io.netty:netty-codec-http2` (bsc#1272303).
    - CVE-2026-59901: infinite loop in `io.netty:netty-codec-compression` (bzip2) (bsc#1272304).
    - CVE-2026-59919: improper CR/LF neutralization in `io.netty:netty-codec-haproxy` (bsc#1272305).
    - CVE-2026-59920: improper CR/LF neutrolization in `io.netty:netty-codec-stomp` (bsc#1272306).
    - CVE-2026-59921: improper CR/LF neutralization in `io.netty:netty-codec-http` (multipart) (bsc#1272307).
    - Memory leak in `io.netty:netty-codec-dns`  (bsc#1272519).
    - Uncontrolled resource consumption in `io.netty:netty-codec-xml` (bsc#1272518).

    Other updates and bugfixes:

    - Upgrade to upstream version 4.1.136:
      - SingleThreadEventExecutor: document Throwable safety contract         on run()
      - Make HTTP/2 frame hashCode consistent with equals
      - Add BlockHound exception for DnsQueryIdSpace (#16896)
      - FlowControlHandler: Fix autoRead behavior
      - Fix incorrect bounds in error message of         HpackDecoder.setMaxHeaderListSize
      - MQTT: Fix MQTT decoder size check after variable header replay
      - MQTT: Make the decodeProperties early-REPLAY check actually         fire
      - Reject control characters at the boundary of HTTP method names         (#16723)
      - Update to latest tcnative release
      - Fix HTTP 2 PUSH_PROMISE stream association validation
      - Fix GZIP FEXTRA extra-field handling in JdkZlibDecoder
      - Add opt-in validation of mandatory pseudo-header fields for         HTTP/2
      - Strictly validate MQTT UTF-8 Encoded String (#16939)
      - Stop DateFormatter trailing token from running past the parse         end
      - IpFilter: Deprecate constructor which use accept by default
      - Add RFC 10008 QUERY Method support (#16966)
      - Correctly release and fail queued traffic-shaping writes on         close (#16959)
      - FlowControlHandler: respect auto-read when toggled while         dequeueing
      - IdleStateHandler: reset firstWriter/ReaderIdleEvent in         resetWriteTimeout/resetReadTimeout (#16982)
      - Fix typo in AbstractSniHandler Javadoc
      - Reconcile AbstractCoalescingBufferQueue readableBytes when it         drains, and fail stuck HTTP/2 streams instead of spinning         empty DATA frames
      - Reject control characters at the boundary of the HTTP version         token (#16971)
      - Reset UTF-8 decode state on CR in StompSubframeDecoder
      - HTTP2: Pass the correct number of arguments when logging         goaway       + FastLz: Guard decompression against truncated input (#17000)       + Fix propagation of startTls for client SslContext handler       + Reject non-token characters in HTTP/2 header names       + Update lz4-java to 1.11.1       + Pin github actions to reduce risk (#17043)       + Merge branches from forks (#17063)

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 an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final     and 4.2.16.Final, Netty's STOMP encoder ( StompSubframeEncoder ) does not escape or validate header values     in CONNECT and CONNECTED frames, so raw newline ( \n ) characters in a header value are written directly     to the wire, allowing an attacker who controls a header value to inject additional STOMP headers. This     happens because the encoder intentionally skips escaping for CONNECT/CONNECTED frames per the STOMP 1.2     specification but never rejects the raw newlines, and since a broker parses each line as a separate     header, an attacker controlling a value such as a user-supplied login or passcode can overwrite connection     parameters or add authentication/role headers to bypass authentication or escalate privileges (the actual     impact is broker-dependent). The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
    (CVE-2026-59920)

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 an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final
    and 4.2.16.Final, Netty's STOMP encoder ( StompSubframeEncoder ) does not escape or validate header values
    in CONNECT and CONNECTED frames, so raw newline ( \n ) characters in a header value are written directly
    to the wire, allowing an attacker who controls a header value to inject additional STOMP headers. This
    happens because the encoder intentionally skips escaping for CONNECT/CONNECTED frames per the STOMP 1.2
    specification but never rejects the raw newlines, and since a broker parses each line as a separate
    header, an attacker controlling a value such as a user-supplied login or passcode can overwrite connection
    parameters or add authentication/role headers to bypass authentication or escalate privileges (the actual
    impact is broker-dependent). The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
    (CVE-2026-59920)

ID	Name	Product	Family	Type	Severity
332130	SUSE SLED15 / SLES15 Security Update : netty, netty-tcnative (SUSE-SU-2026:3482-1)	Nessus	SuSE Local Security Checks	Local	high
330729	Linux Distros Unpatched Vulnerability : CVE-2026-59920	Nessus	Misc.	Local	medium
445157	SCA: security update for io.netty:netty-codec-stomp (GHSA-3g8r-4pfx-jmfh)	Tenable Cloud Security	SCA Checks	Local	medium
445157	SCA: security update for io.netty:netty-codec-stomp (GHSA-3g8r-4pfx-jmfh)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-59920

medium

Tenable Plugins

high

medium

medium

medium