CVE-2026-117892

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation due to use-after-free in the WebRTC: Networking component

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

--- CME Mitigation Guidance (2026-11-02) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.

The highest-value action is to eliminate stale pointer reuse during WebRTC networking connection and packet handling: upgrade to Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6 (or the corresponding fixed Red Hat builds), which corrects object lifecycle management in the WebRTC networking component to prevent use-after-free conditions during connection handling, closing all 2 injection vectors (crafted WebRTC networking operations, malicious WebRTC peer connection). Until patched, this is a concern on client systems running Firefox where users navigate to untrusted web content, so restrict user access to untrusted websites and avoid interaction with untrusted content capable of initiating WebRTC connections. As a compensating measure, enforce Address Space Layout Randomization across user-space processes to prevent reliable exploitation and ROP chain construction. These controls limit blast radius and contain exploitation, but they do not fix the underlying use-after-free defect — apply the upstream patch to fully remediate.

Highest-impact CME: CME-101 ASLR (Address Space Layout Randomization) (medium)