macOS · Mozilla
Mozilla Firefox security updates
The latest version of Mozilla Firefox is 159.0.1, released November 2, 2026. Patch Radar has 15 security fixes for Mozilla Firefox, closing 620 CVEs. The newest security fix is Mozilla Firefox 153.5.0, released October 6, 2026. Version 159.0.1 adds no new CVE fixes and includes all of them.
Latest version
159.0.1
Released Nov 2, 2026
Security fixes
15
On record in Patch Radar
CVEs
620
Closed by those fixes
Exploited
0
Vendor report or CISA KEV
Security fixes, newest first
| Priority | Fix | Fixed in | CVEs | Exploited | Released |
|---|---|---|---|---|---|
| Latest | Mozilla Firefox 159.0.1 | 159.0.1 | Includes every fix below | Nov 2, 2026 | |
| Urgent | Mozilla Firefox 153.5.0 | 153.5.0 | 40 | Oct 6, 2026 | |
| Urgent | Mozilla Firefox 157.0.1 | 157.0.1 | 1 | Oct 5, 2026 | |
| Urgent | Mozilla Firefox 157.0 | 157.0 | 75 | Sep 24, 2026 | |
| Urgent | Mozilla Firefox 156.0 | 156.0 | 70 | Sep 9, 2026 | |
| High | Mozilla Firefox 140.16.0 | 140.16.0 | 2 | Sep 8, 2026 | |
| Urgent | Mozilla Firefox 155.0 | 155.0 | 26 | Aug 26, 2026 | |
| Urgent | Mozilla Firefox 154.0 | 154.0 | 16 | Aug 12, 2026 | |
| Urgent | Mozilla Firefox 140.13.0 | 140.13.0 | 1 | Jul 15, 2026 | |
| Urgent | Mozilla Firefox 153.0 | 153.0 | 61 | Jul 15, 2026 | |
| High | Mozilla Firefox 152.0.6 | 152.0.6 | 2 | Jul 13, 2026 | |
| Urgent | Mozilla Firefox 152.0.4 | 152.0.4 | 1 | Jun 29, 2026 | |
| Urgent | Mozilla Firefox 152.0.1 | 152.0.1 | 42 | Jun 17, 2026 | |
| High | Mozilla Firefox 140.12.0 | 140.12.0 | 2 | Jun 9, 2026 | |
| Urgent | Mozilla Firefox 151.0.2 | 151.0.2 | 35 | May 25, 2026 | |
| Urgent | Mozilla Firefox 150.0.2 | 150.0.2 | 246 | May 6, 2026 | |
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