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Advisory record · GHSA-cc37-9q2j-3hfv

Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length

CVSS 7.5 HighEPSS 0.0062 · 49th percentile

Published by the GitHub Advisory Database at 8 Jun 2026, 19:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-haproxyMaven>=4.2.0.Final, <4.2.15.Final || <4.1.135.Final4.2.15.Final, 4.1.135.Final
Identifiers
GHSA-cc37-9q2j-3hfv · CVE-2026-44893
Weakness (CWE)
CWE-703 · CWE-805
Tags
Published
8 Jun 2026
Updated
10 Sept 2026

Machine-written summary

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

Netty's netty-codec-haproxy Maven package is affected in versions 4.2.0.Final up to but not including 4.2.15.Final, and in versions below 4.1.135.Final. An attacker who can send crafted HAProxy PROXY protocol headers to a server using this decoder can supply an invalid SSL TLV length, causing a memory leak of the retained buffer slice on each such message. The source gives few details on how much memory is lost or whether this leads to denial of service. Upgrade to 4.2.15.Final or 4.1.135.Final.

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
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0062, the 49th percentile, on 5 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.