---
id: "CVE-2026-117957"
kind: "vulnerability"
aliases: ["CVE-2026-117957"]
title: "Firefox: WebRTC networking cryptographic flaw fixed in Firefox 159"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browser", "firefox", "runtime", "webrtc"]
not_affected_if: []
published_at: "2026-10-27T14:16:51+00:00"
first_seen_at: "2026-10-27T14:32:23+00:00"
updated_at: "2026-10-27T14:35:30+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117957", "first_seen_at": "2026-10-27T14:32:23+00:00"}]
---

# Firefox: WebRTC networking cryptographic flaw fixed in Firefox 159

A cryptographic weakness in the WebRTC networking component of Firefox was fixed in Firefox 159 and Firefox ESR 153.6. The sources do not say what an attacker can read or do with 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 browser's About page or with `firefox --version`
- Compare against `159` and `153.6` (ESR)

## Fix

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

## Timeline

- 2026-10-27T14:32:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117957

## From the sources

Cryptographic issue in the WebRTC: Networking component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.

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