Medium severity5.9NVD Advisory· Published Oct 28, 2026
CVE-2026-118370
CVE-2026-118370
Description
libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.
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Affected products
1- Range: <=2.9.0
Patches
Vulnerability mechanics
References
5- github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.cnvd
- github.com/libexpat/libexpat/commit/1bac53c4fc460a03cd9860f39501c7979f6750aenvd
- github.com/libexpat/libexpat/commit/621cb2c78b253ee023a86bc91d6ddb048481c04cnvd
- github.com/libexpat/libexpat/pull/1450nvd
- www.vulncheck.com/advisories/libexpat-through-2.9.0-integer-overflow-in-storeatts-via-attindex-and-nprefixesnvd
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