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Advisory record · GHSA-pwqr-wmgm-9rr8

Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing

CVSS 7.5 HighEPSS 0.0070 · 53rd percentile

Published by the GitHub Advisory Database at 26 Mar 2026, 18:48 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-httpMaven<4.1.132.Final || >=4.2.0.Alpha1, <4.2.10.Final4.1.132.Final, 4.2.10.Final
Identifiers
GHSA-pwqr-wmgm-9rr8 · CVE-2026-33870
Weakness (CWE)
CWE-444
Tags
Published
26 Mar 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-http package is affected in versions below 4.1.132.Final and from 4.2.0.Alpha1 up to but not including 4.2.10.Final. Netty stops parsing chunk extension headers at CR/LF bytes inside quoted strings instead of rejecting the request, so a remote attacker can smuggle extra HTTP requests over a connection. Upgrade to 4.1.132.Final or 4.2.10.Final. The source gives no workaround.

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:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0070, the 53rd 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.