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Advisory record · GHSA-q7qq-6mhp-9rc4

Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value

CVSS 5.4 MediumEPSS 0.0026 · 17th percentile

Published by the GitHub Advisory Database at 23 Oct 2026, 20:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
twistedPyPI<26.10.0rc126.10.0rc1
Identifiers
GHSA-q7qq-6mhp-9rc4 · CVE-2026-115877
Weakness (CWE)
CWE-444
Tags
Published
23 Oct 2026
Updated
23 Oct 2026

Machine-written summary

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

Twisted versions before 26.10.0rc1 (including 26.4.0 and earlier) let a bare CR or LF inside an HTTP header value pass validation, so the HTTP server's parser can read the request differently from a front-end proxy that treats a bare LF as a line terminator. An attacker who can send requests through such a proxy can smuggle a request the proxy never sees, which may bypass access controls or poison a shared connection or cache. Upgrade to Twisted 26.10.0rc1 or later; the source gives no workaround.

Written 1 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
5.4 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0026, the 17th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:08 UTC First seen by agentprime
  2. 31 Oct 2026, 14:08 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.