SUSE-SU-2026:1353-1: important: Security update for netty, netty-tcnative

Wed Apr 15 20:33:03 UTC 2026

# Security update for netty, netty-tcnative

Announcement ID: SUSE-SU-2026:1353-1  
Release Date: 2026-04-15T13:37:31Z  
Rating: important  
References:

  * bsc#1261031
  * bsc#1261043

Cross-References:

  * CVE-2026-33870
  * CVE-2026-33871

CVSS scores:

  * CVE-2026-33870 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-33870 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-33870 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-33871 ( SUSE ):  8.2
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-33871 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-33871 ( NVD ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-33871 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products:

  * Development Tools Module 15-SP7
  * openSUSE Leap 15.6
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7
  * SUSE Package Hub 15 15-SP7

An update that solves two vulnerabilities can now be installed.

## Description:

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

Upidate to 4.1.132:

  * CVE-2026-33870: incorrectly parses quoted strings in HTTP/1.1 can lead to
    request smuggling (bsc#1261031).
  * CVE-2026-33871: sending a flood of CONTINUATION frames can lead to a denial
    of service (bsc#1261043).

Changelog:

  * Upgrade to upstream version 4.1.132
  * Fixes:
  * Fix Incorrect nanos-to-millis conversion in epoll_wait EINTR retry loop
  * Make RefCntOpenSslContext.deallocate more robust
  * HTTP2: Correctly account for padding when decompress
  * Fix high-order bit aliasing in HttpUtil.validateToken
  * fix: the precedence of + is higher than >>
  * AdaptiveByteBufAllocator: make sure byteBuf.capacity() not greater than
    byteBuf.maxCapacity()
  * AdaptivePoolingAllocator: call unreserveMatchingBuddy(...) if byteBuf
    initialization failed
  * Don't assume CertificateFactory is thread-safe
  * Fix HttpObjectAggregator leaving connection stuck after 413 with
    AUTO_READ=false
  * HTTP2: Ensure preface is flushed in all cases
  * Fix UnsupportedOperationException in readTrailingHeaders
  * Fix client_max_window_bits parameter handling in permessage-deflate
    extension
  * Native transports: Fix possible fd leak when fcntl fails.
  * Kqueue: Fix undefined behaviour when GetStringUTFChars fails and
    SO_ACCEPTFILTER is supported
  * Kqueue: Possible overflow when using
    netty_kqueue_bsdsocket_setAcceptFilter(...)
  * Native transports: Fix undefined behaviour when GetStringUTFChars fails
    while open FD
  * Epoll: Add null checks for safety reasons
  * Epoll: Use correct value to initialize mmsghdr.msg_namelen
  * Epoll: Fix support for IP_RECVORIGDSTADDR
  * AdaptivePoolingAllocator: remove ensureAccessible() call in capacity(int)
    method
  * Epoll: setTcpMg5Sig(...) might overflow
  * JdkZlibDecoder: accumulate decompressed output before firing channelRead
  * Limit the number of Continuation frames per HTTP2 Headers (bsc#1261043,
    CVE-2026-33871)
  * Stricter HTTP/1.1 chunk extension parsing (bsc#1261031, CVE-2026-33870)
  * rediff
  * Upgrade to upstream version 4.1.131
  * NioDatagramChannel.block(...) does not early return on failure
  * Support for AWS Libcrypto (AWS-LC) netty-tcnative build
  * codec-dns: Decompress MX RDATA exchange domain names during DNS record
    decoding
  * Buddy allocation for large buffers in adaptive allocator
  * SslHandler: Only resume on EventLoop if EventLoop is not shutting down
    already
  * Wrap ECONNREFUSED in PortUnreachableException for UDP
  * Bump com.ning:compress-lzf (4.1)
  * Fix adaptive allocator bug from not noticing failed allocation
  * Avoid loosing original read exception
  * Backport multiple adaptive allocator changes
  * Upgrade to version 4.1.130
  * Upgrade to version 2.0.75 Final
  * No formal changelog present
  * Needed by netty >= 4.2.11

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * openSUSE Leap 15.6  
    zypper in -t patch openSUSE-SLE-15.6-2026-1353=1

  * Development Tools Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Development-Tools-15-SP7-2026-1353=1

  * SUSE Package Hub 15 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Packagehub-Subpackages-15-SP7-2026-1353=1

## Package List:

  * openSUSE Leap 15.6 (aarch64 ppc64le s390x x86_64)
    * netty-tcnative-2.0.75-150200.3.36.1
    * netty-4.1.132-150200.4.43.1
  * openSUSE Leap 15.6 (noarch)
    * netty-tcnative-javadoc-2.0.75-150200.3.36.1
    * netty-javadoc-4.1.132-150200.4.43.1
  * Development Tools Module 15-SP7 (aarch64 ppc64le s390x x86_64)
    * netty-tcnative-2.0.75-150200.3.36.1
    * netty-tcnative-debugsource-2.0.75-150200.3.36.1
  * SUSE Package Hub 15 15-SP7 (aarch64 ppc64le s390x x86_64)
    * netty-4.1.132-150200.4.43.1
  * SUSE Package Hub 15 15-SP7 (noarch)
    * netty-javadoc-4.1.132-150200.4.43.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-33870.html
  * https://www.suse.com/security/cve/CVE-2026-33871.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1261031
  * https://bugzilla.suse.com/show_bug.cgi?id=1261043

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