---
id: "CVE-2026-117894"
kind: "vulnerability"
aliases: ["CVE-2026-117894"]
title: "Firefox: WebRTC signaling boundary error fixed in Firefox 159"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "firefox", "runtime", "webrtc"]
not_affected_if: ["firefox-already-updated"]
published_at: "2026-10-27T14:16:44+00:00"
first_seen_at: "2026-10-27T14:32:22+00:00"
updated_at: "2026-10-27T14:37:45+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117894", "first_seen_at": "2026-10-27T14:32:22+00:00"}]
---

# Firefox: WebRTC signaling boundary error fixed in Firefox 159

Firefox's WebRTC signaling component mishandles boundary conditions, a memory-safety style flaw. The sources do not say what an attacker can gain from it beyond that it was fixed in Firefox 159 and Firefox ESR 153.6.

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

## How to check

- Run `Firefox --version` or open the about:support page and compare against `159` or `153.6` for ESR builds
- Check the Firefox version on managed fleets with your endpoint management tool

## Fix

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

## Timeline

- 2026-10-27T14:32:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117894

## From the sources

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

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_