VULNERABILITY INTELLIGENCE

CVE-2023-6856

CVSS score8.8 HIGH

EPSS probability20.63%

CISA KEVNot currently listed

Published2023-12-19

Last modified2026-06-17

Description

The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.