CVE-2026-100832 is a use-after-free vulnerability affecting the Graphics: Canvas2D component in Mozilla Firefox. Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, potentially leading to memory corruption and security issues. Mozilla has addressed this vulnerability by releasing patches in Firefox ESR 153.4, 115.42, and 140.17. The vulnerability is rated as high impact by Mozilla, indicating a serious security concern. No evidence of exploitation in the wild has been reported as of the advisory date.

The vulnerability could allow an attacker to cause memory corruption through use-after-free in the Canvas2D graphics component, potentially leading to arbitrary code execution or sandbox escape. Mozilla classifies the impact as high, reflecting the severity of the flaw. However, there are no known active exploits in the wild at this time.

Mozilla has released official fixes for this vulnerability in Firefox ESR versions 153.4, 115.42, and 140.17. Users and administrators should update to one of these fixed versions or later to remediate the issue. No additional mitigation steps are required beyond applying the official patches.