CVE-2026-12324

Vulnerability

Incorrect boundary conditions exist in the Graphics: CanvasWebGL component of Firefox. This vulnerability affects versions prior to Firefox 152 and Firefox ESR prior to 140.12. The exact conditions required to trigger the bug are not detailed in the available references, but it involves improper handling of boundaries in WebGL canvas operations [1][2].

Exploitation

An attacker could potentially exploit this vulnerability by crafting a malicious web page that triggers the boundary condition in the CanvasWebGL component. No authentication or special network position is required beyond the ability to serve web content to a vulnerable browser. The specific steps are not disclosed in the references.

Impact

The impact of successful exploitation is not explicitly stated in the available references. However, incorrect boundary conditions in graphics components often lead to memory corruption, which could be leveraged for arbitrary code execution or denial of service. The severity is rated as high in the associated advisories for similar CVEs, but the impact for this specific CVE is not detailed [1][2].

Mitigation

The vulnerability is fixed in Firefox 152 and Firefox ESR 140.12, both released on June 16, 2026 [1][2]. Users should update to these versions or later. No workarounds are provided.