HIGHCVSS 7.5Vulnerability
CVE-2026-76641
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.
Properties
- severity
- HIGH
- cvss_severity
- HIGH
- cvss_score
- 7.5
- retrieved_at
- 2026-09-25T15:10:02+00:00
- score
- 7.5
- last_source
- NVD
- cve_id
- CVE-2026-76641
- cvss_vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- signal_observed_at
- 2026-09-25T15:10:02+00:00
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- published_at
- 2026-08-20T18:16:51.887
- last_modified
- 2026-09-24T20:02:50.260
Related Entities (2)
HAS_WEAKNESS (1)
→[Weakness]Out-of-bounds Read
DESCRIBED_BY (1)
→[Source]NVD
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