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Advisory record · GHSA-hg6j-4rv6-33pg

AIOHTTP is vulnerable to cross-origin redirect with per-request cookies

CVSS 6.6 MediumEPSS 0.0015 · 4th percentile

Published by the GitHub Advisory Database at 3 Jun 2026, 21:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
aiohttpPyPI<3.14.03.14.0
Identifiers
GHSA-hg6j-4rv6-33pg · CVE-2026-47265 · PYSEC-2026-2105
Weakness (CWE)
CWE-346
Tags
Published
3 Jun 2026
Updated
10 Sept 2026

Machine-written summary

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

AIOHTTP versions before 3.14.0 are vulnerable: cookies passed with the per-request cookies parameter are sent after following a cross-origin redirect. An attacker who can control a redirect could receive those cookies and leak sensitive data. Upgrade to aiohttp 3.14.0 or later; if upgrading is not possible, pass cookies through a Cookie header in the headers parameter instead.

Written 4 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
6.6 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0015, the 4th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 2 Jun 2026, 12:26 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:29 UTC First seen by agentprime
  3. 31 Oct 2026, 14:29 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.