CVE-2026-4709

Description

Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

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

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

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

Firefox < 149

Firefox ESR < 115.34

Firefox ESR < 140.9

Thunderbird < 149

Thunderbird < 140.9

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-4709 (Conceptual)
This HTML attempts to trigger the GMP component boundary issue.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-4709 PoC</title>
</head>
<body>
    <h1>GMP Boundary Condition Test</h1>
    <!-- Malicious media file that triggers the boundary condition -->
    <video id="targetVideo">
        <source src="malicious_media.mp4" type="video/mp4">
        Your browser does not support the video tag.
    </video>
    <script>
        // Attempt to trigger the vulnerability by manipulating the media element
        const video = document.getElementById('targetVideo');
        video.play().catch(e => console.log('Interaction required for autoplay'));
        
        // Further manipulation to stress the GMP component
        video.currentTime = 999999; 
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-4709
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-4709
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-4709/
[4] VulDB https://vuldb.com/cve/CVE-2026-4709
[5] https://bugzilla.mozilla.org/show_bug.cgi?id=2016329
[6] https://bugzilla.mozilla.org/show_bug.cgi?id=2016342
[7] https://www.mozilla.org/security/advisories/mfsa2026-20/
[8] https://www.mozilla.org/security/advisories/mfsa2026-21/
[9] https://www.mozilla.org/security/advisories/mfsa2026-22/
[10] https://www.mozilla.org/security/advisories/mfsa2026-23/
[11] https://www.mozilla.org/security/advisories/mfsa2026-24/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-4709", "sourceIdentifier": "[email protected]", "published": "2026-03-24T13:16:06.810", "lastModified": "2026-04-13T15:17:41.983", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9."}, {"lang": "es", "value": "Condiciones de contorno incorrectas en el componente Audio/Video: GMP. Esta vulnerabilidad afecta a Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, y Thunderbird < 140.9."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-754"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-754"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "versionEndExcluding": "115.34.0", "matchCriteriaId": "063BE653-69B0-4543-9A90-BC7A62C943B5"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "versionEndExcluding": "149.0", "matchCriteriaId": "02F2B82F-E997-4D5F-BBB0-237E4962555B"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "versionStartIncluding": "128.0", "versionEndExcluding": "140.9.0", "matchCriteriaId": "525DEC0C-BB47-46C6-9AEB-98F27D4685FE"}]}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2016329", "source": "[email protected]", "tags": ["Permissions Required"]}, {"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2016342", "source": "[email protected]"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-20/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-21/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-22/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-23/", "source": "[email protected]"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-24/", "source": "[email protected]"}]}}