CVE-2023-6856

Name of the Vulnerable Software and Affected Versions Firefox ESR versions prior to 115.6 Thunderbird versions prior to 115.6 Firefox versions prior to 121

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.

Recommendations For Firefox ESR versions prior to 115.6, update to version 115.6 or later. For Thunderbird versions prior to 115.6, update to version 115.6 or later. For Firefox versions prior to 121, update to version 121 or later. As a temporary workaround, consider disabling the WebGL DrawElementsInstanced method until a patch is available.