Firefox Developer Edition (en-US) 142.0
Firefox Developer Edition (en-US) 142.0, released August 8, 2025, fixes 9 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.
Superseded. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every CVE on this page. Install that instead.
Priority of the 9 CVEs
Applies to
| Product | Version |
|---|---|
| Firefox Developer Edition (en-US) | 142.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2025-9187 | Memory safety bugs fixed in Firefox 142 and Thunderbird 142 | 9.8 | 0.0049 | None reported |
| High | CVE-2025-9179 | Sandbox escape due to invalid pointer in the Audio/Video: GMP component | 9.8 | 0.0061 | None reported |
| High | CVE-2025-9185 | Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142 | 8.1 | 0.0051 | None reported |
| High | CVE-2025-9182 | Denial-of-service due to out-of-memory in the Graphics: WebRender component | 7.5 | 0.0041 | None reported |
| High | CVE-2025-9184 | Memory safety bugs fixed in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142 | 8.1 | 0.0040 | None reported |
| High | CVE-2025-9181 | Uninitialized memory in the JavaScript Engine component | 7.5 | 0.0039 | None reported |
| High | CVE-2025-9180 | Same-origin policy bypass in the Graphics: Canvas2D component | 8.1 | 0.0027 | None reported |
| Routine | CVE-2025-9183 | Spoofing issue in the Address Bar component | 6.5 | 0.0027 | None reported |
| Routine | CVE-2025-9186 | Spoofing issue in the Address Bar component of Firefox Focus for Android | 6.5 | 0.0022 | None reported |
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