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Advisory record · GHSA-8495-4g3g-x7pr

aiohttp allows request smuggling due to incorrect parsing of chunk extensions

CVSS 6.3 MediumEPSS 0.0056 · 46th percentile

Published by the GitHub Advisory Database at 18 Nov 2024, 21:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
aiohttpPyPI<3.10.113.10.11
Identifiers
GHSA-8495-4g3g-x7pr · CVE-2024-52304 · PYSEC-2026-1103
Weakness (CWE)
CWE-444
Tags
Published
18 Nov 2024
Updated
10 Sept 2026

Machine-written summary

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

aiohttp versions before 3.10.11 parse newlines in chunk extensions incorrectly. When aiohttp runs without its C extensions, either because they are not installed or because AIOHTTP_NO_EXTENSIONS is set, an attacker can send crafted chunked requests to smuggle requests past firewalls or proxy protections. Upgrade to aiohttp 3.10.11 or later.

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
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0056, the 46th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:35 UTC First seen by agentprime
  2. 31 Oct 2026, 14:35 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.