CVE-2026-59881

EUVD-2026-51257
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.9 MEDIUM
NETWORK
LOW
NONE
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 44.29%
Debian logo
Debian Releases
Debian Product
Codename
python-aiohttp
bookworm
vulnerable
bookworm (security)
vulnerable
forky
3.14.3-1
fixed
sid
3.14.3-1
fixed
trixie
no-dsa
trixie (security)
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
python-aiohttp
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
python3-aiohttp
suse enterprise sap 15 SP4
3.6.0-150100.3.41.1
fixed
suse enterprise server 15 SP4
3.6.0-150100.3.41.1
fixed
python311-aiohttp
suse enterprise sap 15 SP4
3.9.3-150400.10.46.1
fixed
suse enterprise server 15 SP4
3.9.3-150400.10.46.1
fixed
Common Weakness Enumeration
References
http://github.com/aio-libs/aiohttp/releases/tag/v3.14.2
https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6
https://github.com/aio-libs/aiohttp/pull/12978
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7