Bug 2509792

Summary:	CVE-2026-11564 curl: libcurl: Certificate validation bypass due to incorrect connection reuse [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Tomas Hoger <thoger>
Component:	curl	Assignee:	Jan Macku <jamacku>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	45	CC:	jamacku, jmigacz, kdudka, lzaoral, msekleta, paul, vmihalko
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["4e93f5bc-0a7e-461d-9f83-8c76da1edcf1"]}
Fixed In Version:		Doc Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2496754

Description Tomas Hoger 2026-07-31 14:54:06 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.

libcurl keeps previously used connections in a connection pool for subsequent
transfers to reuse if one of them matches the setup.

An easy handle that first uses default native CA trust can continue trusting
the native platform store after the application switches that same handle to
custom CA material for a later transfer.

Comment 1 Aoife Moloney 2026-08-17 15:44:27 UTC

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

Comment 2 Jan Macku 2026-08-27 08:35:12 UTC

f43 is not affected - Affected versions: curl 8.17.0 to and including 8.20.0