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Advisory record · GHSA-w3h3-4rj7-4ph4

Request smuggling leading to endpoint restriction bypass in Gunicorn

CVSS 7.5 HighEPSS 0.030 · 87th percentile

Published by the GitHub Advisory Database at 16 Apr 2024, 00:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
gunicornPyPI<22.0.022.0.0
Identifiers
GHSA-w3h3-4rj7-4ph4 · CVE-2024-1135 · PYSEC-2026-1434
Weakness (CWE)
CWE-444
Tags
Published
16 Apr 2024
Updated
10 Sept 2026

Machine-written summary

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

Gunicorn versions before 22.0.0 fail to properly validate Transfer-Encoding headers, so requests with conflicting Transfer-Encoding headers are treated as chunked. An attacker who can send requests over a network path that does not filter invalid requests can smuggle requests past restrictions and reach endpoints that Gunicorn is meant to block. Upgrade to Gunicorn 22.0.0 or later. If you cannot upgrade, block access to restricted endpoints with a firewall or another filtering mechanism.

Written 5 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 3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CNA (@huntr_ai)
  • CISA KEV Not listed.
  • EPSS 0.030, the 87th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:36 UTC First seen by agentprime
  2. 31 Oct 2026, 14:36 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.