CVE-2026-9963

Description

Uninitialized Use 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 inside a sandbox 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 on iOS < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-9963: Uninitialized Use in Chrome iOS
This is a conceptual HTML structure to demonstrate the trigger condition.
Actual exploitation requires specific memory layout and heap grooming.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9963 PoC</title>
    <style>
        /* Styles to force specific rendering paths */
        body { overflow: hidden; }
        .target { width: 100%; height: 100%; }
    </style>
</head>
<body>
    <div id="trigger" class="target">
        <!-- Content designed to trigger uninitialized memory usage -->
        <p>Please perform specific UI gestures here.</p>
    </div>
    <script>
        // Attempt to interact with the vulnerable component
        const trigger = document.getElementById('trigger');
        trigger.addEventListener('touchstart', (e) => {
            console.log('Interaction detected. Triggering vulnerability logic...');
            // Malicious logic would go here to exploit the uninitialized memory
        });
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9963
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9963
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9963/
[4] VulDB https://vuldb.com/cve/CVE-2026-9963
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/505143241

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9963", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:54.527", "lastModified": "2026-05-29T14:16:34.350", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Uninitialized Use 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 inside a sandbox 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-457"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/505143241", "source": "[email protected]"}]}}