Bug 2509780 - CVE-2026-57053 libidn1.34: GNU libidn: Out-of-bounds read in ToUnicode APIs [fedora-all]
Summary: CVE-2026-57053 libidn1.34: GNU libidn: Out-of-bounds read in ToUnicode APIs [...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: libidn1.34
Version: 45
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Orphan Owner
QA Contact: Fedora Extras Quality Assurance
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: 2026-08-17 15:44 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:

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Description mkaminsk 2026-07-31 14:00:21 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 Aoife Moloney 2026-08-17 15:44:20 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.
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