Bug 2509778

Summary:	CVE-2026-57053 libidn: GNU libidn: Out-of-bounds read in ToUnicode APIs [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	mkaminsk
Component:	libidn	Assignee:	Miroslav Lichvar <mlichvar>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	epel10	CC:	jorton, mh, mlichvar
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["edb126fa-0503-4da1-a976-e924cc6ba1fc"]}
Fixed In Version:	libidn-1.44-1.el10_3	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-12 00:29:19 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:	2491878

Description mkaminsk 2026-07-31 14:00:11 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.

GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the ToUnicode APIs because of mishandling in idna_to_unicode_internal. The affected code is not present in libidn2.

Comment 1 Fedora Update System 2026-08-03 10:31:23 UTC

FEDORA-EPEL-2026-25669258a6 (libidn-1.44-1.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-25669258a6

Comment 2 Miroslav Lichvar 2026-08-03 10:32:28 UTC

The fix is in EPEL10 only, no update planned for EPEL9.

Comment 3 Fedora Update System 2026-08-04 01:28:05 UTC

FEDORA-EPEL-2026-25669258a6 has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-25669258a6

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-08-12 00:29:19 UTC

FEDORA-EPEL-2026-25669258a6 (libidn-1.44-1.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.