Description
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.
Published: 2026-01-05
Score: 6.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6141-1 python-aiohttp security update
Github GHSA Github GHSA GHSA-69f9-5gxw-wvc2 AIOHTTP's unicode processing of header values could cause parsing discrepancies
History

Wed, 14 Jan 2026 19:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N'}

 cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

Tue, 06 Jan 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 06 Jan 2026 14:30:00 +0000

Type Values Removed Values Added
First Time appeared Aio-libs
Aio-libs aiohttp Session
Aio-libs Project
Aio-libs Project aiohttp
Aiohttp
Aiohttp aio-libs
Aiohttp aiohttp
Vendors & Products Aio-libs
Aio-libs aiohttp Session
Aio-libs Project
Aio-libs Project aiohttp
Aiohttp
Aiohttp aio-libs
Aiohttp aiohttp

Tue, 06 Jan 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N'}

threat_severity

Moderate

Mon, 05 Jan 2026 23:00:00 +0000

Type Values Removed Values Added
Description 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.
Title AIOHTTP's Unicode processing of header values could cause parsing discrepancies
Weaknesses CWE-444
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

Aio-libs Aiohttp Session
Aio-libs Project Aiohttp
Aiohttp Aio-libs Aiohttp
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-06T19:03:34.338Z

Reserved: 2025-12-29T20:46:13.630Z

Link: CVE-2025-69224

cve-icon Vulnrichment

Updated: 2026-01-06T14:25:45.572Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-05T23:15:40.697

Modified: 2026-01-14T19:12:27.570

Link: CVE-2025-69224

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-01-05T22:35:42Z

Links: CVE-2025-69224 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-01-06T14:16:26Z

Weaknesses