CVE-2026-8556

Description

Inappropriate implementation in ANGLE in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

3.1

Severity

LOW

CVSS Vector

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

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

<!-- Proof of Concept for CVE-2026-8556 -->
<!-- This HTML page demonstrates the trigger mechanism -->
<html>
<head>
    <title>CVE-2026-8556 PoC</title>
</head>
<body>
    <h3>ANGLE Information Leak Test</h3>
    <canvas id="glCanvas" width="640" height="480"></canvas>
    <script>
        // Initialize WebGL context which uses ANGLE on Windows
        const canvas = document.getElementById('glCanvas');
        const gl = canvas.getContext('webgl');

        if (!gl) {
            console.log("WebGL not supported");
        } else {
            console.log("Attempting to trigger ANGLE implementation issue...");
            
            // Create a shader or buffer operation that exploits the improper implementation
            // Note: Actual exploitation requires specific knowledge of the memory layout
            // and a compromised renderer process.
            const vertexShaderSource = `
                attribute vec4 aVertexPosition;
                void main() {
                    gl_Position = aVertexPosition;
                }
            `;
            
            const shader = gl.createShader(gl.VERTEX_SHADER);
            gl.shaderSource(shader, vertexShaderSource);
            gl.compileShader(shader);

            if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
                console.error('Shader compile error:', gl.getShaderInfoLog(shader));
            }
            
            // Hypothetical trigger for cross-origin data read
            // This section would contain the exploit payload in a real attack scenario
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8556
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8556
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8556/
[4] VulDB https://vuldb.com/cve/CVE-2026-8556
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/500052361

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8556", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:17.250", "lastModified": "2026-05-15T15:16:55.280", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in ANGLE in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker who had compromised the renderer process to leak cross-origin data 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:U/C:L/I:N/A:N", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-284"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/500052361", "source": "[email protected]"}]}}