---
id: "CVE-2026-117996"
kind: "vulnerability"
aliases: ["CVE-2026-117996"]
title: "Firefox: WebRTC boundary-condition flaw fixed in Firefox 159"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "firefox", "firefox-esr", "runtime", "webrtc"]
not_affected_if: ["fixed-version"]
published_at: "2026-10-27T14:16:57+00:00"
first_seen_at: "2026-10-27T14:32:25+00:00"
updated_at: "2026-10-27T14:34:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117996", "first_seen_at": "2026-10-27T14:32:25+00:00"}]
---

# Firefox: WebRTC boundary-condition flaw fixed in Firefox 159

Firefox's WebRTC component mishandles boundary conditions, a memory-safety class of bug. The sources do not say what an attacker gets beyond that, so impact is unconfirmed.

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

## How to check

- Check the installed Firefox version with `about:support` or the Help menu
- Compare against the fixed release: Firefox `159` or Firefox ESR `153.6`
- Confirm whether the affected WebRTC feature is in use

## Fix

- Update Firefox to `159` or later
- Update Firefox ESR to `153.6` or later

## Timeline

- 2026-10-27T14:32:25+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117996

## From the sources

Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.

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