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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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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

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

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

Link: CVE-2026-56132

cve-icon Vulnrichment

No data.

cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-06-19T07:30:16Z

Weaknesses