---
id: "CVE-2026-117923"
kind: "vulnerability"
aliases: ["CVE-2026-117923"]
title: "Firefox: use-after-free in Audio/Video component can be triggered by page content"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["desktop-browsers", "firefox", "firefox-esr", "runtime"]
not_affected_if: ["already-patched"]
published_at: "2026-10-27T14:16:47+00:00"
first_seen_at: "2026-10-27T14:32:22+00:00"
updated_at: "2026-10-27T14:37:15+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117923", "first_seen_at": "2026-10-27T14:32:22+00:00"}]
---

# Firefox: use-after-free in Audio/Video component can be triggered by page content

A use-after-free bug in Firefox's Audio/Video component can corrupt memory when handling media. The sources do not say what an attacker can run once the memory is corrupted.

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

## How to check

- Check the installed Firefox version in the browser's About page or with `firefox --version`, and compare it to the fixed releases.
- Check ESR installs with `firefox --version` against `115.44` and `153.6`.

## Fix

- Update Firefox to `159` or later.
- Update Firefox ESR to `115.44` or later on the 115 branch, or `153.6` or later on the 153 branch.

## Timeline

- 2026-10-27T14:32:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117923

## From the sources

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

---

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