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.
History

Sat, 27 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
Title Heap-Based Buffer Overflow in libexpat XML Parser expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow
Weaknesses CWE-131
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 22 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 19 Jun 2026 06:30:00 +0000

Type Values Removed Values Added
Title Heap-Based Buffer Overflow in libexpat XML Parser

Fri, 19 Jun 2026 04:30:00 +0000

Type Values Removed Values Added
Description 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.
First Time appeared Libexpat Project
Libexpat Project libexpat
Weaknesses CWE-821
CPEs cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
Vendors & Products Libexpat Project
Libexpat Project libexpat
References
Metrics cvssV3_1

{'score': 6.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-06-19T03:00:42.975Z

Updated: 2026-06-22T14:59:54.057Z

Reserved: 2026-06-19T03:00:42.577Z

Link: CVE-2026-56132

cve-icon Vulnrichment

Updated: 2026-06-22T14:59:47.771Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-06-19T03:00:42Z

Links: CVE-2026-56132 - Bugzilla