CVE-2026-47265

EUVD-2026-34007

02.06.2026, 20:16

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the `cookies` parameter on requests are sent after following a cross-origin redirect. If a developer uses the `cookies` parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade, using a `Cookie` header in the `headers` parameter is not vulnerable.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 4%

Affected Products (NVD)

Vendor	Product	Version
aiohttp	aiohttp	𝑥 < 3.14.0

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

python-aiohttp

bookworm	vulnerable
bookworm (security)	vulnerable
bullseye	vulnerable
bullseye (security)	vulnerable
forky	3.14.1-4 fixed
sid	3.14.1-4 fixed
trixie	no-dsa
trixie (security)	vulnerable

Common Weakness Enumeration

CWE-346 - Origin Validation Error
The software does not properly verify that the source of data or communication is valid.

References

https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hg6j-4rv6-33pg