# CVE-2026-59920: netty-tcnative: This update for netty, netty-tcnative fixes the following issues:  Upgrade netty to upstream version 4.1.136 and nett...

CVE-2026-59920 is fixed in 2 products on 1 platform, first by SUSE-SU-2026:3482-1, released August 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-59920
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 4, 2026

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | netty sles 15.7 | 4.1.136-150200.4.53.1 | [SUSE-SU-2026:3482-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3482-1.md) | Aug 4, 2026 |
| Linux | netty-tcnative sles 15.6 | 2.0.80-150200.3.48.1 | [SUSE-SU-2026:3482-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3482-1.md) | Aug 4, 2026 |
| Linux | netty-tcnative sles 15.7 | 2.0.80-150200.3.48.1 | [SUSE-SU-2026:3482-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3482-1.md) | Aug 4, 2026 |

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