Vulnerability Details CVE-2026-113351
libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 41.0%
CVSS Severity
CVSS v3 Score 5.9
References
- https://github.com/libexpat/libexpat
- https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L1560
- https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L860-L884
- https://github.com/libexpat/libexpat/pull/1431
- https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.9.0-denial-of-service-via-xml-parserreset
Products affected by CVE-2026-113351
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cpe:2.3:a:libexpat_project:libexpat:2.7.2
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cpe:2.3:a:libexpat_project:libexpat:2.7.3
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cpe:2.3:a:libexpat_project:libexpat:2.7.4
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cpe:2.3:a:libexpat_project:libexpat:2.7.5
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cpe:2.3:a:libexpat_project:libexpat:2.8.0
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cpe:2.3:a:libexpat_project:libexpat:2.8.1
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cpe:2.3:a:libexpat_project:libexpat:2.8.2
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cpe:2.3:a:libexpat_project:libexpat:2.8.3
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cpe:2.3:a:libexpat_project:libexpat:2.8.4