GHSA-rfp9-ffqc-h4x8HighCVSS 7.5
Expat through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input,...
🔗 CVE IDs covered (1)
📋 Description
Expat through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input, allowing malformed UTF-16 sequences to be accepted. Attackers can craft UTF-16 encoded XML with lone high surrogates that consume following code units, hiding markup characters from the parser and enabling XML injection attacks.
🔗 References (8)
- https://nvd.nist.gov/vuln/detail/CVE-2026-93990
- https://github.com/libexpat/libexpat/pull/1282
- https://github.com/libexpat/libexpat/commit/ff6e1d7e750bbe245178f51a47a965dc8342861a
- https://github.com/libexpat/libexpat
- https://www.vulncheck.com/advisories/expat-through-2.8.4-malformed-utf-16-acceptance-via-unchecked-surrogate
- https://blog.hartwork.org/posts/expat-2-8-5-released
- https://github.com/libexpat/libexpat/releases/tag/R_2_8_5
- https://github.com/advisories/GHSA-rfp9-ffqc-h4x8