CVE-2026-9885

Description

Insufficient validation of untrusted input in UI in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)

CVSS Details

CVSS Score

8.3

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

Google Chrome for Mac < 148.0.7778.216

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-2026-9885
This PoC demonstrates the trigger mechanism requiring a prior Renderer RCE.
-->
<html>
<head>
<title>CVE-2026-9885 PoC</title>
</head>
<body>
<script>
// Simulate the crafted input that bypasses UI validation
function trigger_sandbox_escape() {
    try {
        // In a real scenario, this involves precise heap grooming
        // and IPC message manipulation targeting the specific UI vulnerability.
        var malicious_payload = new Uint8Array(1024);
        
        // Fill payload with pattern designed to trigger validation bypass
        for (let i = 0; i < malicious_payload.length; i++) {
            malicious_payload[i] = 0x90; // NOP sled or specific byte sequence
        }
        
        console.log("[+] Payload prepared. Attempting to exploit UI validation flaw...");
        
        // Hypothetical internal call to trigger the bug
        // window.chrome.send('vulnerable_ui_command', malicious_payload);
        
    } catch (e) {
        console.log("[-] Exploit failed: " + e.message);
    }
}

// Execute trigger
trigger_sandbox_escape();
</script>
<p>Check browser console for PoC status.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9885
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9885
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9885/
[4] VulDB https://vuldb.com/cve/CVE-2026-9885
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/508452241

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9885", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:46.490", "lastModified": "2026-05-29T16:16:34.640", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient validation of untrusted input in UI in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape 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:H/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/508452241", "source": "[email protected]"}]}}