CVE-2026-34519

NameCVE-2026-34519
DescriptionAIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the reason parameter when creating a Response may be able to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1132582

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python-aiohttp (PTS)bullseye3.7.4-1vulnerable
bullseye (security)3.7.4-1+deb11u1vulnerable
bookworm, bookworm (security)3.8.4-1+deb12u1vulnerable
trixie3.11.16-1vulnerable
forky, sid3.13.3-3vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python-aiohttpsource(unstable)(unfixed)1132582

Notes

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mwh4-6h8g-pg8w
Fixed by; https://github.com/aio-libs/aiohttp/commit/53b35a2f8869c37a133e60bf1a82a1c01642ba2b (v3.13.4)
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