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Advisories

Expat Out-of-Bounds Read via dtdCopy

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severity
high
date
Affecting

  • libexpat <= 2.8.3

CWE
  • CWE-125 Out-of-bounds Read
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
ZeyouLiu (@liuzeyouzeyou), ZeyouLiu (@liuzeyouzeyou)
Description
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.

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