CVE-2026-59881

unknowncovered by 1 sourcefirst seen 2026-07-30

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.

⚡ Watch CVE-2026-59881

Get an email if CVE-2026-59881 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Exploitation outlook

Low exploitation risk0.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.

Advisory coverage (1)

unknownCVE-2026-59881: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.…nvd · 2026-07-30

External references

NVD record for CVE-2026-59881

CVE.org record

Embed the live status

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2026-59881 status](https://www.csirts.com/badge/CVE-2026-59881)](https://www.csirts.com/cve/CVE-2026-59881)