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In libexpat before 2.2.8 crafted XML input could fool the parser into changing from DTD parsing to document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber) then resulted in a heap-based buffer over-read.

🗓️ 01 Dec 2021 08:00:00Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 2 Views

Libexpat pre-2.2.8 allows early switch from DTD to document parsing, causing heap buffer over-read.

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microsoftcm1_expat_2.4.1-1Range<2.4.1-1

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01 Dec 2021 08:00Current
7.9High risk
Vulners AI Score7.9
CVSS 25
CVSS 3.16.5 - 7.5
EPSS0.06643
SSVC
libexpatvulnerabilitydoctype switchheap overread
2