CVE-2026-4458

// PoC Concept for CVE-2026-4458 // This is a simplified representation of the extension code that triggers the UAF. // manifest.json /* { "manifest_version": 3, "name": "Malicious Extension", "version": "1.0", "background": { "service_worker": "exploit.js" }, "permissions": ["tabs", "scripting"] } */ // exploit.js // The actual trigger involves complex object manipulation. // This pseudocode demonstrates the logic. let vulnerableObject = null; function triggerUAF() { // Step 1: Create an object that Chrome Extensions will manage vulnerableObject = document.createElement('div'); // Step 2: Setup a handler that will access the object later setTimeout(() => { // Step 3: Force the underlying C++ object to be freed // (Simulated by removing reference or specific API call) vulnerableObject.remove(); // Step 4: Attempt to access the freed memory // This is where the Use-After-Free occurs console.log(vulnerableObject.innerHTML); }, 100); } // In a real exploit, heap grooming would happen here to control the freed memory. triggerUAF();

{"cve": {"id": "CVE-2026-4458", "sourceIdentifier": "[email protected]", "published": "2026-03-20T02:16:39.060", "lastModified": "2026-03-20T17:58:37.903", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Extensions in Google Chrome prior to 146.0.7680.153 allowed an attacker who convinced a user to install a malicious extension to potentially exploit heap corruption via a crafted Chrome Extension. (Chromium security severity: High)"}, {"lang": "es", "value": "Uso después de liberación en Extensiones en Google Chrome anterior a 146.0.7680.153 permitió a un atacante que convenció a un usuario para instalar una extensión maliciosa explotar potencialmente la corrupción de pila a través de una extensión de Chrome manipulada. (Gravedad de seguridad de Chromium: Alta)"}], "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": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "146.0.7680.153", "matchCriteriaId": "3526166A-E44B-47EE-8E47-1C1937CB2B87"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_18.html", "source": "[email protected]", "tags": ["Vendor Advisory", "Release Notes"]}, {"url": "https://issues.chromium.org/issues/489619753", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}