🛡️ CVE-2025-69224 — aiohttp

🟢 CVSS 2.0 — Low ✅ No Known Exploit CWE-444 OSV
2.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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.

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity low, availability none.

Weakness class

CVE-2025-69224 is classified as CWE-444: HTTP Request Smuggling. A proxy and a server disagree on where one request ends, letting an attacker slip a second request past the front end.

Affected software

CVE-2025-69224 is recorded against 1 package.

  • aiohttp (fixed in 3.13.3)

Timeline and source

Published on 5 January 2026 and last revised on 7 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)

CVE-2025-69224 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity LOW
CVSS Score 2.0
CVSS Vector 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
CWE CWE-444
Public Exploit ✅ No
Source OSV
Published 2026-01-05
Updated 2026-08-12
Modified 2026-07-07

Affected Packages

Software From version Fixed in
aiohttp — 3.13.3

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