Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.
Related Weaknesses (CWE)
References
- http://github.com/aio-libs/aiohttp/releases/tag/v3.14.2
- https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a
- https://github.com/aio-libs/aiohttp/pull/12978
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7
FAQ
What is CVE-2026-59881?
CVE-2026-59881 is a documented vulnerability. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-def...
How severe is CVE-2026-59881?
CVSS scoring is not yet available for CVE-2026-59881. Check NVD for updates.
Is there a patch for CVE-2026-59881?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.