CVE-2026-54274

AIOHTTP: Incomplete websocket frame payloads bypass memory limits

CVSS 6.6 MEDIUMEPSS 0.3%CWE-770

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.6EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

22 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

aio-libs · aiohttp

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References

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