CVE-2025-69224

MEDIUM6.5EPSS 0.04%

AIOHTTP's unicode processing of header values could cause parsing discrepancies

Published: 1/5/2026Modified: 2/4/2026

Also known as:GHSA-69f9-5gxw-wvc2CGA-69pv-rrfw-6ghrDEBIAN-CVE-2025-69224

Description

### Summary The Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters. ### Impact If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. ------ Patch: https://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0

Affected packages (2)

Debian/python-aiohttpfrom 0
PyPI/aiohttpfrom 0, < 3.13.3

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 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
osv	CVSS 3.1	MEDIUM6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References (5)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-69224
ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2025-69224
PATCHhttps://github.com/aio-libs/aiohttp
WEBhttps://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0
WEBhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-69f9-5gxw-wvc2