2490669 – (CVE-2026-56132) CVE-2026-56132 expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow

Bug 2490669 (CVE-2026-56132) - CVE-2026-56132 expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow

Summary: CVE-2026-56132 expat: libexpat: Arbitrary Code Execution via Heap-based Buffe...

Keywords:
Status:	NEW
Alias:	CVE-2026-56132
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	---
Assignee:	Product Security DevOps Team
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:	2493638 2493639
Blocks:
TreeView+	depends on / blocked

Reported:	2026-06-19 05:01 UTC by OSIDB Bzimport
Modified:	2026-06-26 18:23 UTC (History)
CC List:	5 users (show)
Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-06-19 05:01:29 UTC

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

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