Mozilla Firefox (en-US) 156.0
Mozilla Firefox (en-US) 156.0, released September 15, 2026, fixes 72 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 72 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Firefox (en-US) | 156.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-92036 | Incorrect boundary conditions in the Networking: HTTP component | 9.8 | 0.0055 | None reported |
| Urgent | CVE-2026-92037 | Incorrect boundary conditions in the DOM: Animation component | 9.8 | 0.0055 | None reported |
| Urgent | CVE-2026-92061 | Incorrect boundary conditions in the Security: Process Sandboxing component | 9.8 | 0.0055 | None reported |
| Urgent | CVE-2026-92066 | Sandbox escape in the Profile Backup component | 9.8 | 0.0055 | None reported |
| Urgent | CVE-2026-92051 | Spoofing issue due to invalid pointer in the Graphics component | 9.1 | 0.0053 | None reported |
| Urgent | CVE-2026-92050 | Sandbox escape due to race condition in the XPConnect component | 9.1 | 0.0041 | None reported |
| Urgent | CVE-2026-92018 | Sandbox escape in the DOM: Core & HTML component | 9.6 | 0.0033 | None reported |
| Urgent | CVE-2026-92032 | Sandbox escape due to invalid pointer in the Graphics component | 9.6 | 0.0032 | None reported |
| Urgent | CVE-2026-92038 | Mitigation bypass in the Remote Settings Client component | 9.1 | 0.0032 | None reported |
| Urgent | CVE-2026-92041 | Mitigation bypass in the DOM: Networking component | 9.1 | 0.0032 | None reported |
| Urgent | CVE-2026-92075 | Mitigation bypass in the Networking component | 9.1 | 0.0032 | None reported |
| Urgent | CVE-2026-92045 | Sandbox escape due to incorrect boundary conditions in the WebRTC component | 9.6 | 0.0030 | None reported |
| Urgent | CVE-2026-92048 | Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component | 9.0 | 0.0028 | None reported |
| Urgent | CVE-2026-92034 | Site isolation issue in the Graphics component | 9.1 | 0.0027 | None reported |
| Urgent | CVE-2026-92057 | Mitigation bypass in the Enterprise Policies component | 9.1 | 0.0025 | None reported |
| Urgent | CVE-2026-92079 | Mitigation bypass in the Widget: Win32 component | 9.1 | 0.0025 | None reported |
| Urgent | CVE-2026-92071 | Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component | 9.6 | 0.0024 | None reported |
| Urgent | CVE-2026-92059 | Incorrect boundary conditions in the DOM: Editor component | 9.3 | 0.0011 | None reported |
| High | CVE-2026-92040 | Use-after-free in the JavaScript: WebAssembly component | 8.8 | 0.0042 | None reported |
| High | CVE-2026-92005 | Use-after-free in the Audio/Video: Web Codecs component | 7.5 | 0.0036 | None reported |
| High | CVE-2026-92035 | Sandbox escape due to incorrect boundary conditions in the Graphics component | 9.6 | 0.0033 | None reported |
| High | CVE-2026-92006 | Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component | 8.8 | 0.0033 | None reported |
| High | CVE-2026-92044 | Information disclosure in the Networking: HTTP component | 7.5 | 0.0032 | None reported |
| High | CVE-2026-92022 | Use-after-free in the DOM: HTML Parser component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-92023 | Use-after-free in the XML component | 8.8 | 0.0032 | None reported |
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