Bug 2509778 - CVE-2026-57053 libidn: GNU libidn: Out-of-bounds read in ToUnicode APIs [epel-all]
Summary: CVE-2026-57053 libidn: GNU libidn: Out-of-bounds read in ToUnicode APIs [epel...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora EPEL
Classification: Fedora
Component: libidn
Version: epel10
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Miroslav Lichvar
QA Contact:
URL:
Whiteboard: {"flaws": ["edb126fa-0503-4da1-a976-e...
Depends On:
Blocks: CVE-2026-57053
TreeView+ depends on / blocked
 
Reported: 2026-07-31 14:00 UTC by mkaminsk
Modified: 2026-08-12 00:29 UTC (History)
3 users (show)

Fixed In Version: libidn-1.44-1.el10_3
Clone Of:
Environment:
Last Closed: 2026-08-12 00:29:19 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

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.
Note You need to log in before you can comment on or make changes to this bug.