Bug 2491203 (CVE-2026-56412) - CVE-2026-56412 libexpat: libexpat: Use-after-free vulnerability due to improper handling of XML CDATA sections
Summary: CVE-2026-56412 libexpat: libexpat: Use-after-free vulnerability due to improp...
Keywords:
Status: NEW
Alias: CVE-2026-56412
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2493315 2493316 2493317 2493318 2493319
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-21 17:01 UTC by OSIDB Bzimport
Modified: 2026-06-26 00:42 UTC (History)
23 users (show)

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

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-06-21 17:01:15 UTC 
libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.
Note You need to log in before you can comment on or make changes to this bug.