Firefox Developer Edition (de) 147.0
Firefox Developer Edition (de) 147.0, released December 22, 2025, fixes 18 CVEs in Firefox Developer Edition (de). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Firefox Developer Edition (de) is 151.0, which also fixes every one of these CVEs.
Superseded. The latest Firefox Developer Edition (de) is 151.0, which also fixes every CVE on this page. Install that instead.
Priority of the 18 CVEs
Applies to
| Product | Version |
|---|---|
| Firefox Developer Edition (de) | 147.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-0892 | Memory safety bugs fixed in Firefox 147 and Thunderbird 147 | 9.8 | 0.0045 | None reported |
| Urgent | CVE-2026-0881 | Sandbox escape in the Messaging System component | 10.0 | 0.0035 | None reported |
| Urgent | CVE-2025-14860 | Use-after-free in the Disability Access APIs component | 9.8 | 0.0032 | None reported |
| High | CVE-2026-0880 | Sandbox escape due to integer overflow in the Graphics component | 8.8 | 0.0054 | None reported |
| High | CVE-2026-0879 | Sandbox escape due to incorrect boundary conditions in the Graphics component | 9.8 | 0.0050 | None reported |
| High | CVE-2026-0891 | Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147 | 8.1 | 0.0048 | None reported |
| High | CVE-2026-0877 | Mitigation bypass in the DOM: Security component | 8.1 | 0.0047 | None reported |
| High | CVE-2026-0878 | Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component | 8.0 | 0.0047 | None reported |
| High | CVE-2026-0882 | Use-after-free in the IPC component | 8.8 | 0.0047 | None reported |
| High | CVE-2026-0884 | Use-after-free in the JavaScript Engine component | 9.8 | 0.0046 | None reported |
| High | CVE-2026-0889 | Denial-of-service in the DOM: Service Workers component | 7.5 | 0.0046 | None reported |
| High | CVE-2026-0885 | Use-after-free in the JavaScript: GC component | 7.5 | 0.0040 | None reported |
| High | CVE-2026-0886 | Incorrect boundary conditions in the Graphics component | 7.5 | 0.0038 | None reported |
| High | CVE-2026-0883 | Information disclosure in the Networking component | 7.5 | 0.0036 | None reported |
| High | CVE-2026-0887 | Clickjacking issue, information disclosure in the PDF Viewer component | 7.5 | 0.0033 | None reported |
| High | CVE-2026-0890 | Spoofing issue in the DOM: Copy & Paste and Drag & Drop component | 7.5 | 0.0030 | None reported |
| High | CVE-2025-14861 | Memory safety bugs fixed in Firefox 146.0.1 | 8.8 | 0.0025 | None reported |
| Routine | CVE-2026-0888 | Information disclosure in the XML component | 5.3 | 0.0035 | None reported |
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