Fedora 42 — firefox — vulnerability — patch and remediation guide
🔴 Critical ⏱ 15–90 min Last verified: 25 May 2026 Affected versions: Fedora 42 📖 ~4 min read • Source: Fedora update FEDORA-2026-7f6ee801e2 Upstream summary: Update NSS to 3.123.1 Update to Firefox 151.0 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution […]