Fluid Attacks Database

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. If using the optimised C parser (the default in pre-built wheels), then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
debian 13	python-aiohttp	=3.11.16-1 \|\| =3.11.16-1+deb13u1 \|\| =3.12.15-1 \|\| =3.13.0-1 \|\| =3.13.1-1 \|\| =3.13.3-1 \|\| =3.13.3-2 \|\| =3.13.3-3 \|\| =3.13.5-1 \|\| =3.14.0-1 \|\| =3.14.1-1 \|\| =3.14.1-2 \|\| =3.14.1-3 \|\| =3.14.1-4 \|\| =3.14.1-5 \|\| =3.14.3-1	-
debian 12	python-aiohttp	=3.10.0-1 \|\| =3.10.1-1 \|\| =3.10.10-1 \|\| =3.10.10-2 \|\| =3.10.11-1 \|\| =3.10.3-1 \|\| =3.10.3-2 \|\| =3.10.3-3 \|\| =3.10.4-1 \|\| =3.10.5-1 \|\| =3.10.6-1 \|\| =3.10.8-1 \|\| =3.11.15-1 \|\| =3.11.16-1 \|\| =3.12.15-1 \|\| =3.13.0-1 \|\| =3.13.1-1 \|\| =3.13.3-1 \|\| =3.13.3-2 \|\| =3.13.3-3 \|\| =3.13.5-1 \|\| =3.14.0-1 \|\| =3.14.1-1 \|\| =3.14.1-2 \|\| =3.14.1-3 \|\| =3.14.1-4 \|\| =3.14.1-5 \|\| =3.14.3-1 \|\| =3.8.4-1 \|\| =3.8.4-1+deb12u1 \|\| =3.8.5-1 \|\| =3.8.6-1 \|\| =3.9.1-1 \|\| =3.9.5-1	-
debian 14	python-aiohttp	=3.11.16-1 \|\| =3.12.15-1 \|\| =3.13.0-1 \|\| =3.13.1-1 \|\| =3.13.3-1 \|\| =3.13.3-2 \|\| =3.13.3-3 \|\| =3.13.5-1 \|\| =3.14.0-1 \|\| >=0 <3.14.1-1	3.14.1-1
pypi	aiohttp	>=0 <3.14.1	3.14.1

Aliases

1. CVE-2026-542772. NVD-2026-542773. OSV-DEBIAN-2026-542774. OSV-2026-542775. GHSA-63hw-fmq6-xxg26. GCVE-2026-542777. SECURITY-TRACKER-CVE-2026-54277

References

1. https://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hw-fmq6-xxg22. https://github.com/aio-libs/aiohttp/commit/5ab61bb4cd88f19b712f12c7c9295fe262bf804d

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