Vulnerability Description
libexpat through 2.10.0 contains an out-of-bounds read vulnerability in unknown_toUtf8() and unknown_toUtf16() in xmltok.c when handling application-registered unknown encodings. Attackers can supply a document ending in a truncated multibyte sequence so the convert callback reads past the parse buffer, leaking adjacent memory or crashing applications.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/libexpat/libexpat
- https://github.com/libexpat/libexpat/blob/a70841d9ffa64ddde29ab824ed6305035ebe4c
- https://github.com/libexpat/libexpat/pull/1492
- https://www.vulncheck.com/advisories/libexpat-through-2.10.0-out-of-bounds-read-
FAQ
What is CVE-2026-124317?
CVE-2026-124317 is a vulnerability with a CVSS score of 4.8 (MEDIUM). libexpat through 2.10.0 contains an out-of-bounds read vulnerability in unknown_toUtf8() and unknown_toUtf16() in xmltok.c when handling application-registered unknown encodings. Attackers can supply ...
How severe is CVE-2026-124317?
CVE-2026-124317 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-124317?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.