CVE-2026-9918

Description

Inappropriate implementation in Tint in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

9.6

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/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

<!--
  PoC for CVE-2026-9918 (Conceptual)
  This HTML page attempts to trigger the Tint implementation issue.
  Open in a vulnerable Chrome version (< 148.0.7778.216).
-->
<html>
<head>
    <title>CVE-2026-9918 PoC</title>
</head>
<body>
    <script>
        function triggerVulnerability() {
            console.log("Attempting to trigger Tint component bug...");
            try {
                // Setup canvas context that interacts with Tint
                const canvas = document.createElement('canvas');
                const gl = canvas.getContext('webgl2');
                
                if (!gl) {
                    console.log("WebGL2 not supported.");
                    return;
                }

                // Crafted shader data to exploit the implementation issue
                // Specific shader syntax would depend on the exact bug in Tint
                const vertexShaderSource = `
                    // Malicious shader syntax targeting Tint parser
                    #version 300 es
                    void main() { gl_Position = vec4(0.0, 0.0, 0.0, 1.0); }
                `;

                const fragmentShaderSource = `
                    // Fragment shader designed to trigger memory corruption
                    #version 300 es
                    precision mediump float;
                    out vec4 color;
                    void main() { color = vec4(1.0, 0.0, 0.0, 1.0); }
                `;

                const vs = gl.createShader(gl.VERTEX_SHADER);
                gl.shaderSource(vs, vertexShaderSource);
                gl.compileShader(vs);

                const fs = gl.createShader(gl.FRAGMENT_SHADER);
                gl.shaderSource(fs, fragmentShaderSource);
                gl.compileShader(fs);

                const program = gl.createProgram();
                gl.attachShader(program, vs);
                gl.attachShader(program, fs);
                gl.linkProgram(program);
                gl.useProgram(program);

                // Trigger draw call to execute the vulnerable path
                gl.drawArrays(gl.TRIANGLES, 0, 3);
                
                console.log("Shader executed. Check for renderer crash or escape.");
            } catch (e) {
                console.error("Exception caught: " + e.message);
            }
        }

        window.onload = triggerVulnerability;
    </script>
    <h1>CVE-2026-9918 Proof of Concept</h1>
    <p>If the browser is vulnerable, the renderer may crash or escape the sandbox.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9918
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9918
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9918/
[4] VulDB https://vuldb.com/cve/CVE-2026-9918
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/500099471

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9918", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:49.897", "lastModified": "2026-05-29T16:16:37.770", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inappropriate implementation in Tint in Google Chrome prior to 148.0.7778.216 allowed a remote attacker 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:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 9.6, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 6.0}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-269"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/500099471", "source": "[email protected]"}]}}