Bug 2509739

Summary:	CVE-2026-59881 python-aiohttp: AIOHTTP: Denial of Service via unnegotiated WebSocket compression [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Matteo Signorini <msignori>
Component:	python-aiohttp	Assignee:	Jonathan Wright <jonathan>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	45	CC:	code, igor.raits, jonathan, mail, python-packagers-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["cac533cf-6c94-4ac7-b5f3-b77dcc9d46c5"]}
Fixed In Version:	python-aiohttp-3.14.3-3.fc46 python-aiohttp-3.14.3-3.fc45	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-24 08:07:33 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2509545

Description Matteo Signorini 2026-07-31 11:05:03 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Ben Beasley 2026-07-31 13:01:27 UTC

In Rawhide, this should be fixed by updating to 3.14.2 or later.

In F44/F43, this can’t be fixed that way because (as is typical for “minor” releases) 3.14.0 contains documented breaking changes, https://github.com/aio-libs/aiohttp/releases#release-v3.14.0. Looking at https://www.cve.org/CVERecord?id=CVE-2026-59881, https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7, and the fix https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6, it may be possible to backport the fix to older upstream releases for F43/F44.

I’ve been updating this package lately via my python-packagers-sig group membership, but I wish someone else would take an interest in it. I will probably work on this CVE after a while, but it isn’t at the top of my list.

Comment 2 Aoife Moloney 2026-08-17 15:44:11 UTC

This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 3 Fedora Update System 2026-08-24 08:04:20 UTC

FEDORA-2026-84f7af8f97 (python-aiohttp-3.14.3-3.fc46) has been submitted as an update to Fedora 46.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-84f7af8f97

Comment 4 Fedora Update System 2026-08-24 08:07:33 UTC

FEDORA-2026-84f7af8f97 (python-aiohttp-3.14.3-3.fc46) has been pushed to the Fedora 46 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 5 Fedora Update System 2026-08-24 08:25:23 UTC

FEDORA-2026-e76e1f737b (python-aiohttp-3.14.3-3.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-e76e1f737b

Comment 6 Fedora Update System 2026-08-24 08:28:33 UTC

FEDORA-2026-e76e1f737b (python-aiohttp-3.14.3-3.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.