CVE-2026-118370 — Vulnerability intelligence
libexpat project — libexpat
Published:
- CVSS
- 8.2
- CISA KEV
- Not listed; not proof of no exploitation
Original source text (not a translation)
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.