CVE-2026-9956

Description

Use after free in iOS in Google Chrome on iOS prior to 148.0.7778.216 allowed a remote attacker who convinced a user to engage in specific UI gestures to execute arbitrary code 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 for iOS < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-9956 -->
<!-- This PoC attempts to trigger the Use After Free via UI gestures -->
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>CVE-2026-9956 PoC</title>
    <style>
        /* Styles to force specific rendering/layout */
        body { touch-action: manipulation; }
        #target { width: 100%; height: 100px; background: red; }
    </style>
</head>
<body>
    <div id="target">Perform specific UI gesture here (e.g., pinch/zoom)</div>
    <script>
        // Setup objects to be freed
        let obj = document.createElement('div');
        
        // Function to simulate the trigger event
        function trigger_uaf() {
            // Step 1: Free the object (simulated)
            obj.remove();
            
            // Step 2: Attempt to reuse memory via UI event handling
            // In a real exploit, this would involve precise timing and memory layout control
            console.log("Attempting to access freed memory...");
            
            // Attempt to trigger the crash or code execution
            // Real exploit requires heap grooming and ROP chain
        }

        // Attach event listener mimicking the specific UI gesture
        document.getElementById('target').addEventListener('touchstart', trigger_uaf);
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9956
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9956
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9956/
[4] VulDB https://vuldb.com/cve/CVE-2026-9956
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/504195132

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9956", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:53.797", "lastModified": "2026-05-29T12:16:29.407", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in iOS in Google Chrome on iOS prior to 148.0.7778.216 allowed a remote attacker who convinced a user to engage in specific UI gestures to execute arbitrary code 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_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/504195132", "source": "[email protected]"}]}}