CVE-2026-79591
A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.
- Published Sep 10, 2026
- CVSS 7.8 high
- 0.2% chance of exploitation in the next 30 days (EPSS)