PT-2026-66548
CVE-2026-59881
·
Published
2026-07-30
·
Updated
2026-11-03
Description by
CVSS 4.0
6.9
MediumMetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Name of the Vulnerable Software and Affected Versions
AIOHTTP versions prior to 3.14.2
Description
The WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension (a mechanism used to compress WebSocket messages to reduce bandwidth) was not negotiated. This behavior allows a malicious server to trigger unexpected CPU and memory consumption.
Recommendations
Update to version 3.14.2.
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