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Advisory record · GHSA-45q3-82m4-75jr

Netty has HTTP Header Injection via HttpProxyHandler Disabled Validation (Incomplete Fix CVE-2025-67735)

CVSS 2.9 LowEPSS 0.011 · 64th percentile

Published by the GitHub Advisory Database at 7 May 2026, 00:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-handler-proxyMaven<4.1.133.Final || >=4.2.0.Alpha1, <4.2.13.Final4.1.133.Final, 4.2.13.Final
Identifiers
GHSA-45q3-82m4-75jr · CVE-2026-42578
Weakness (CWE)
CWE-93 · CWE-113
Tags
Published
7 May 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Netty's io.netty:netty-handler-proxy (HttpProxyHandler) versions before 4.1.133.Final and from 4.2.0.Alpha1 before 4.2.13.Final are affected. HttpProxyHandler disables header validation, so header values in outboundHeaders supplied by the application are not checked for CRLF sequences. An attacker who can influence those header values may inject additional HTTP headers into the CONNECT request sent to the proxy. Upgrade to 4.1.133.Final or 4.2.13.Final; if upgrading is not possible, do not pass untrusted input into outboundHeaders.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
2.9 Low 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.011, the 64th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.