Improper input validation in Aio-Libs Aiohttp
CVE-2026-59881
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.003 (22.7th percentile) — read the EPSS interpretation.
Affected products
- Aio-libs Aiohttp — versions < 3.14.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)