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Security fixes

  • CVE-2026-XXXXX : unbounded resource usage in io.netty:netty-codec-http (SPDY)
  • CVE-2026-XXXXX : unbounded resource usage in io.netty:netty-codec-http (HTTP/1.1)
  • CVE-2026-XXXXX : denial of service vector in io.netty:netty-codec-http2
  • CVE-2026-XXXXX : improper certificate validation in io.netty:netty-handler-ssl-ocsp
  • CVE-2026-XXXXX : memory leak in io.netty:netty-codec-stomp
  • CVE-2026-XXXXX : unbounded resource usage in io.netty:netty-codec-http
  • CVE-2026-XXXXX : denial of service vector in io.netty:netty-codec-stomp
  • CVE-2026-XXXXX : parser desync/response smuggling in io.netty:netty-codec-memcache
  • CVE-2026-XXXXX : improper header validation in io.netty:netty-codec-http
  • CVE-2026-XXXXX : unbounded resource usage in io.netty:netty-codec-smtp
  • CVE-2026-XXXXX : memory leak in io.netty:netty-codec-haproxy
  • CVE-2026-XXXXX : request smuggling in io.netty:netty-codec-http (RTSP)
  • CVE-2026-XXXXX : request smuggling in io.netty:netty-codec-http (HTTP/1)
  • CVE-2026-XXXXX : improper header validation in io.netty:netty-codec-http2
  • CVE-2026-XXXXX : improper header validation in io.netty:netty-codec-http2
  • CVE-2026-XXXXX : improper header validation in io.netty:netty-codec-http2
  • CVE-2026-XXXXX : unbounded resource usage in io.netty:netty-codec-redis
  • CVE-2026-XXXXX : improper header validation in io.netty:netty-codec-http (HTTP/1.1)
  • CVE-2026-XXXXX : request smuggling vector in io.netty:netty-codec-http (HTTP/1.1)
  • CVE-2026-XXXXX : unbounded resource usage in io.netty:netty-codec-mqtt
  • CVE-2026-XXXXX : improper CRLF neutralization in io.netty:netty-codec-smtp
  • CVE-2026-XXXXX : improper certificate validation in io.netty:netty-handler-ssl-ocsp
  • CVE-2026-XXXXX : improper header validation in io.netty:netty-codec-http2

Compatibility note

HTTP/2 header value validation is now enabled by default. HTTP/2 header name validation has always been enabled by default, with an option to disable it, but HTTP/2 header value validation has been disabled by default until now. Configuration options still exist to disable this, but validation of HTTP header names and values are now both opt-in by default rather than opt-out.

What's Changed

Full Changelog: https://github.com/netty/netty/compare/netty-4.1.137.Final...netty-4.1.138.Final

Source: README.md, updated 2026-09-09