What is GHSA-8cvq-g9xh-jmpf?

GHSA-8cvq-g9xh-jmpf is a security advisory published by GitHub Security Advisories with High severity. A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of...

Which CVE IDs does GHSA-8cvq-g9xh-jmpf cover?

GHSA-8cvq-g9xh-jmpf covers the following CVE IDs: CVE-2026-79591. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-8cvq-g9xh-jmpf?

GHSA-8cvq-g9xh-jmpf has a CVSS v3 base score of 7.8, published by GitHub Security Advisories.

GHSA-8cvq-g9xh-jmpfHighCVSS 7.8

A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of...

Vendor

GitHub Security Advisories

Published

September 10, 2026

Last Modified

September 15, 2026

🔗 CVE IDs covered (1)

CVE-2026-79591 →

📋 Description

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.

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-79591
https://github.com/libxls/libxls/issues/161
https://github.com/libxls/libxls/pull/164/changes/902c8f9b13710c3a13b6232fb86626c5c729402c
https://github.com/advisories/GHSA-8cvq-g9xh-jmpf