libexpat before 2.8.2 has an integer overflow in copyString.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Libexpat Project
  • Libexpat

No data.

No data.

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Vendors Products
References
Link Providers
https://github.com/libexpat/libexpat/commit/16e2efd867ea8567ffa012210b52ef5918e20817 cve-icon
History

Sun, 21 Jun 2026 17:45:00 +0000

Type Values Removed Values Added
Title Integer Overflow in libexpat copyString Function

Sun, 21 Jun 2026 16:00:00 +0000

Type Values Removed Values Added
Description libexpat before 2.8.2 has an integer overflow in copyString.
First Time appeared Libexpat Project
Libexpat Project libexpat
Weaknesses CWE-190
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:

Updated: 2026-06-21T15:51:11.303Z

Reserved: 2026-06-21T15:51:10.930Z

Link: CVE-2026-56408

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-21T17:30:16Z