CVE-2026-8518

Description

Use after free in Blink in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Critical)

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)

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

<!--
Conceptual PoC for Use-After-Free in Blink.
This is a generic template illustrating the structure often used to trigger UAFs.
Specific heap grooming and object layout are required for a functional exploit.
-->
<!DOCTYPE html>
<html>
<head>
    <title>UAF PoC Template</title>
    <script>
        function trigger_uaf() {
            // Step 1: Create a vulnerable object
            let vulnerable_obj = document.createElement('div');
            document.body.appendChild(vulnerable_obj);

            // Step 2: Setup a reference or event listener that keeps a dangling pointer
            vulnerable_obj.onclick = function() {
                // This function attempts to access properties of the object
                console.log("Object accessed: " + this.innerHTML);
            };

            // Step 3: Remove the object from DOM (freeing memory)
            document.body.removeChild(vulnerable_obj);
            vulnerable_obj = null;

            // Step 4: Force Garbage Collection (Implementation dependent)
            // In a real exploit, heap spraying happens here to occupy the freed memory.
            if (window.gc) {
                window.gc();
            }

            // Step 5: Trigger the dangling pointer access
            // Simulating an event that triggers the handler on freed memory
            console.log("Potential UAF triggered");
        }

        window.onload = trigger_uaf;
    </script>
</head>
<body>
    <p>Check console for UAF attempt.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8518
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8518
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8518/
[4] VulDB https://vuldb.com/cve/CVE-2026-8518
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/497830330

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8518", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:12.550", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Blink in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Critical)"}], "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"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/497830330", "source": "[email protected]"}]}}