CVE-2026-54274

AIOHTTP: Incomplete websocket frame payloads bypass memory limits

State: Published
Severity: 6.6 Medium
Published: Jun 22, 2026
Updated: Jun 22, 2026
Reserved: Jun 12, 2026

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, if an attacker sends large incomplete websocket frame payloads, it may be possible to bypass the usual size limits on memory use. This vulnerability is fixed in 3.14.1.

Scores

CVSS	Score	Vector	Source
4.0	6.6 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	GitHub_M

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
aiohttpaio-libs	< 3.14.1Affected

References

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-xcgm-r5h9-7989
https://github.com/aio-libs/aiohttp/commit/14b6ee851fb16ec199acb950de0c82d476799e7d

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