CVE-2026-76641 (High) detected in libexpatR_2_7_5

[mend-bolt-for-github]

CVE-2026-76641 - High Severity Vulnerability

Vulnerable Library - libexpatR_2_7_5

https://github.com/libexpat/libexpat

Library home page: https://github.com/sailfishos-mirror/libexpat.git

Found in base branches: stable/4.0, master

Vulnerable Source Files (1)

/contrib/expat/lib/xmlparse.c

Vulnerability Details

Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption by processing XML with external entity parsers created via XML_ExternalEntityParserCreate. A struct size mismatch between ELEMENT_TYPE members causes storeAtts to read the attIndex member past allocated memory boundaries, resulting in failure to normalize whitespace in non-CDATA attributes or a wild pointer dereference causing a segfault. This vulnerability was introduced by the fix for CVE-2026-66046.

Publish Date: 2026-08-20

URL: CVE-2026-76641

CVSS 3 Score Details (7.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

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