AIOHTTP vulnerable to DoS when bypassing asserts_CVE-2025-69227

6.6 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.

Basic Information

ID CVE-2025-69227

Source GitHub_M

Published Jan 5, 2026 at 23:19

Affected Product

Vendor aio-libs

Product aiohttp

Version < 3.13.3

Affected Versions aio-libs aiohttp < 3.13.3

CWE Classification

CWE-835

References

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    "published": "2026-01-05T23:19:31.396Z",
    "modified": "2026-01-05T23:19:31.396Z",
    "type": "cve",
    "title": "AIOHTTP vulnerable to DoS when bypassing asserts",
    "source": "GitHub_M",
    "references": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jj3x-wxrx-4x23\nhttps://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259",
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