Bug 2509709 - CVE-2026-56131 expat: libexpat: Use-after-free vulnerability due to insufficient handler call depth tracking [fedora-all]
Summary: CVE-2026-56131 expat: libexpat: Use-after-free vulnerability due to insuffici...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: expat
Version: 45
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Tomas Korbar
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["2caaa677-be26-491e-ba70-6...
Depends On:
Blocks: CVE-2026-56131
TreeView+ depends on / blocked
 
Reported: 2026-07-31 07:45 UTC by Srikanth Balasubramanian
Modified: 2026-08-17 15:44 UTC (History)
2 users (show)

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

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Description Srikanth Balasubramanian 2026-07-31 07:45:57 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.

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).
Comment 1 Aoife Moloney 2026-08-17 15:44:05 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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