CVE-2026-8580

Description

Use after free in Mojo in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)

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)

No configuration data available.

Google Chrome < 148.0.7778.168

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- PoC for CVE-2026-8580: Mojo Use After Free -->
<!-- This HTML page is designed to trigger the UAF condition -->
<html>
<head>
    <title>CVE-2026-8580 PoC</title>
</head>
<body>
    <h1>Testing CVE-2026-8580</h1>
    <script>
        // Attempt to trigger the Use-After-Free in Mojo
        function trigger_vulnerability() {
            try {
                // Create a vulnerable object scenario
                let mojo_object = create_mojo_handle();
                
                // Logic to force a premature free
                free_mojo_handle(mojo_object);
                
                // Access the freed memory to trigger the crash or exploit
                // This is where the Use-After-Free occurs
                exploit_mojo_handle(mojo_object);
                
            } catch (e) {
                console.log("Exception occurred: " + e);
            }
        }

        // Mock functions representing the internal Mojo calls
        function create_mojo_handle() { return {}; }
        function free_mojo_handle(obj) { /* free memory */ }
        function exploit_mojo_handle(obj) { /* reuse memory */ }

        // Execute on load
        window.onload = trigger_vulnerability;
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8580
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8580
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8580/
[4] VulDB https://vuldb.com/cve/CVE-2026-8580
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/496639647

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8580", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:20.367", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Mojo in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to potentially perform a sandbox escape 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: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"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/496639647", "source": "[email protected]"}]}}