CVE-2026-9886

Description

Use after free in Base in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)

CVSS Details

CVSS Score

9.6

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome (Mac) < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  PoC Concept for CVE-2026-9886
  This is a generic representation of a UAF trigger.
  Specific exploitation requires knowledge of the Chrome internal object layout.
-->
<html>
<head>
    <title>CVE-2026-9886 PoC Test</title>
</head>
<body>
<script>
    // Simulation of the UAF trigger logic
    // 1. Allocate target object in Base component
    let targetObject = new ArrayBuffer(1024);
    
    // 2. Store a reference to the object
    let danglingRef = targetObject;
    
    // 3. Trigger the free operation (Vulnerability trigger point)
    // In a real scenario, this might be removing a DOM element or closing a specific channel
    targetObject = null;
    
    // 4. Force Garbage Collection to attempt to reclaim memory
    if (window.gc) {
        window.gc();
    }

    // 5. Attempt to use the dangling reference
    // If the vulnerability exists, accessing 'danglingRef' will use freed memory
    // potentially leading to code execution or a crash.
    try {
        console.log("Attempting to access dangling reference...");
        let view = new Uint8Array(danglingRef);
        console.log("Access successful (Memory not overwritten or UAF triggered)");
    } catch (e) {
        console.log("Access failed: " + e.message);
    }
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9886
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9886
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9886/
[4] VulDB https://vuldb.com/cve/CVE-2026-9886
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/508456788

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9886", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:46.587", "lastModified": "2026-05-29T16:16:34.787", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Base in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker 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:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 9.6, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 6.0}]}, "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/508456788", "source": "[email protected]"}]}}