Bug 2529718 - CVE-2026-86140 libxml2: libxml2: Arbitrary code execution via stack-based buffer overflow in xmlSnprintfElements [fedora-all]
Summary: CVE-2026-86140 libxml2: libxml2: Arbitrary code execution via stack-based buf...
Keywords:
Status: MODIFIED
Alias: None
Product: Fedora
Classification: Fedora
Component: libxml2
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: David King
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["e627ff5c-405a-42ae-8089-e...
Depends On:
Blocks: CVE-2026-86140
TreeView+ depends on / blocked
 
Reported: 2026-09-08 08:35 UTC by Srikanth Balasubramanian
Modified: 2026-09-13 17:35 UTC (History)
1 user (show)

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

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Description Srikanth Balasubramanian 2026-09-08 08:35:54 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.

In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.
Comment 1 Fedora Update System 2026-09-12 09:35:01 UTC 
FEDORA-2026-081eb18404 (0ad-0.28.0-7.fc46, abiword-3.0.8-6.fc46, and 480 more) has been submitted as an update to Fedora 46.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-081eb18404
Comment 2 Fedora Update System 2026-09-13 17:35:39 UTC 
FEDORA-2026-081eb18404 (0ad-0.28.0-7.fc46, abiword-3.0.8-6.fc46, and 483 more) has been pushed to the Fedora 46 stable repository.
If problem still persists, please make note of it in this bug report.
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