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Advisory record · GHSA-hvcg-qmg6-jm4c

Netty: HttpObjectDecoder skips arbitrary initial control characters when only initial CRLF characters are permitted

CVSS 5.3 MediumEPSS 0.0023 · 14th percentile

Published by the GitHub Advisory Database at 15 Jun 2026, 20:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-httpMaven>=4.2.0.Final, <4.2.15.Final || <4.1.135.Final4.2.15.Final, 4.1.135.Final
Identifiers
GHSA-hvcg-qmg6-jm4c · CVE-2026-50020
Weakness (CWE)
CWE-444
Tags
Published
15 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 io.netty:netty-codec-http package, versions from 4.2.0.Final before 4.2.15.Final and from 4.1.0 before 4.1.135.Final (as listed in the advisory's affected range), skips arbitrary ISO control characters before an HTTP request-line instead of only empty CRLF lines. The source describes a possible request-boundary confusion or smuggling attack when a front-end component parses those bytes differently, but it gives few details on the attacker's position or exact steps. Upgrade to 4.2.15.Final or 4.1.135.Final, which are listed as fixed versions.

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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0023, the 14th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 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.