Vulnerabilities CVE-2026-59881

CVE-2026-59881

Medium

Open

TLP:CLEAR

AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

NVD CVE.org

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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.

Details

CVSS Score: 6.9
EPSS Score ⓘ: 0.30%

22.8th percentile
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Confidence: 90%
Published: Jul 30, 2026
Last Modified: Jul 30, 2026

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