GHSA-c6pw-vjr4-wwwrHighCVSS 5.9
libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib...
🔗 CVE IDs covered (1)
📋 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.
🔗 References (8)
- https://nvd.nist.gov/vuln/detail/CVE-2026-118370
- https://github.com/libexpat/libexpat/pull/1450
- https://github.com/libexpat/libexpat/commit/1bac53c4fc460a03cd9860f39501c7979f6750ae
- https://github.com/libexpat/libexpat/commit/621cb2c78b253ee023a86bc91d6ddb048481c04c
- https://github.com/libexpat/libexpat
- https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L4138-L4140
- https://www.vulncheck.com/advisories/libexpat-through-2.9.0-integer-overflow-in-storeatts-via-attindex-and-nprefixes
- https://github.com/advisories/GHSA-c6pw-vjr4-wwwr