CVE-2025-69224

EUVD-2026-1048

05.01.2026, 23:15

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below of the Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters. 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. This issue is fixed in version 3.13.3.

HTTP Request/Response Smuggling

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	6.5 MEDIUM	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 12%

Affected Products (NVD)

Vendor	Product	Version
aiohttp	aiohttp	𝑥 < 3.13.3

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

python-aiohttp

bookworm	vulnerable
bookworm (security)	vulnerable
bullseye	vulnerable
bullseye (security)	vulnerable
forky	3.13.3-3 fixed
sid	3.13.3-3 fixed
trixie	vulnerable

Ubuntu Releases

Ubuntu Product

Codename

python-aiohttp

bionic	ignored
focal	ignored
jammy	Fixed 3.8.1-4ubuntu0.2+esm2 released
noble	Fixed 3.9.1-1ubuntu0.1+esm2 released
plucky	ignored
questing	Fixed 3.11.16-1ubuntu0.1 released
xenial	ignored

Common Weakness Enumeration

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References

https://github.com/aio-libs/aiohttp/commit/32677f2adfd907420c078dda6b79225c6f4ebce0

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-69f9-5gxw-wvc2