CVE-2026-9877

Description

Use after free in ANGLE in Google Chrome 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)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE

Google Chrome < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-9877 (Conceptual)
This HTML attempts to trigger the ANGLE UAF condition via WebGL.
Note: Actual exploitation requires specific heap grooming and renderer compromise.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9877 PoC</title>
</head>
<body>
    <canvas id="glCanvas"></canvas>
    <script>
        const canvas = document.getElementById('glCanvas');
        const gl = canvas.getContext('webgl');
        
        if (!gl) {
            console.log('WebGL not supported');
        } else {
            // Attempt to trigger complex shader compilation which may touch ANGLE internals
            const shaderSource = `
                precision mediump float;
                void main() {
                    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
                }
            `;
            const shader = gl.createShader(gl.FRAGMENT_SHADER);
            gl.shaderSource(shader, shaderSource);
            gl.compileShader(shader);
            
            // Simulate the condition that might lead to UAF in a vulnerable version
            // by forcing context loss or heavy resource allocation/freeing cycles.
            console.log('Shader compiled. Check for crash/sandbox escape.');
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9877
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9877
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9877/
[4] VulDB https://vuldb.com/cve/CVE-2026-9877
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/496445460

Raw JSON Data

JSON

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