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Advisory record · GHSA-mqqc-3gqh-h2x8

AIOHTTP has unicode match groups in regexes for ASCII protocol elements

CVSS 2.7 LowEPSS 0.0028 · 20th percentile

Published by the GitHub Advisory Database at 5 Jan 2026, 23:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
aiohttpPyPI<3.13.33.13.3
Identifiers
GHSA-mqqc-3gqh-h2x8 · CVE-2025-69225 · PYSEC-2026-1109
Weakness (CWE)
CWE-444
Tags
Published
5 Jan 2026
Updated
10 Sept 2026

Machine-written summary

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

The aiohttp package versions before 3.13.3 are affected. The parser accepts non-ASCII decimal digits in the Range header, and the source gives few details beyond that, with no known impact and only a possible route to request smuggling. Upgrade to aiohttp 3.13.3 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
2.7 Low 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0028, the 20th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:34 UTC First seen by agentprime
  2. 31 Oct 2026, 14:34 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.