---
id: "CVE-2026-117911"
kind: "vulnerability"
aliases: ["CVE-2026-117911"]
title: "Firefox: use-after-free in audio and video playback component"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "desktop", "firefox", "runtime"]
not_affected_if: ["fixed-version"]
published_at: "2026-10-27T14:16:46+00:00"
first_seen_at: "2026-10-27T14:32:22+00:00"
updated_at: "2026-10-27T14:37:27+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117911", "first_seen_at": "2026-10-27T14:32:22+00:00"}]
---

# Firefox: use-after-free in audio and video playback component

A use-after-free bug in Firefox's Audio/Video Playback component frees memory that is still used later. An attacker who gets a user to load crafted media could potentially crash the browser or run code in it.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Firefox version in the About Firefox dialog or with `firefox --version`; affected builds are older than `159` on the main branch, `115.44` on ESR 115, and `153.6` on ESR 153.

## Fix

- Update Firefox to `159` or later, or Firefox ESR to `115.44` or `153.6`, depending on the channel in use.

## Timeline

- 2026-10-27T14:32:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117911

## From the sources

Use-after-free in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.

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