Windows apps · Application version · September 2, 2026
Firefox Developer Edition (en-US) 156.0
Firefox Developer Edition (en-US) 156.0, released September 2, 2026, fixes 259 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
259
82 rated Critical
Exploited
0
None reported
Highest CVSS
10.0
Base score, 0 to 10
Highest EPSS
0.0096
61st percentile
Priority of the 259 CVEs
Patch now 0
Urgent 82
High 149
Routine 28
Applies to
| Product | Version |
|---|---|
| Firefox Developer Edition (en-US) | 156.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-74943 | Use-after-free in the Graphics: ImageLib component | 9.8 | 0.0096 | None reported |
| Urgent | CVE-2026-16357 | Incorrect boundary conditions in the Graphics component | 9.8 | 0.0087 | None reported |
| Urgent | CVE-2026-16412 | Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153 | 9.8 | 0.0064 | None reported |
| Urgent | CVE-2026-16395 | Integer overflow in the Audio/Video component | 9.8 | 0.0062 | None reported |
| Urgent | CVE-2026-16402 | Integer overflow in the Graphics: ImageLib component | 9.8 | 0.0062 | None reported |
| Urgent | CVE-2026-16408 | Integer overflow in the Audio/Video: Playback component | 9.8 | 0.0062 | None reported |
| Urgent | CVE-2026-74964 | Integer overflow in the Graphics component | 9.8 | 0.0060 | None reported |
| Urgent | CVE-2026-74989 | Internally found bugs fixed in Thunderbird 154 | 9.8 | 0.0057 | None reported |
| Urgent | CVE-2026-84134 | Other issue in the Profile Backup component | 9.8 | 0.0057 | None reported |
| Urgent | CVE-2026-16389 | Incorrect boundary conditions, integer overflow in the Libraries component in NSS | 9.8 | 0.0057 | None reported |
| Urgent | CVE-2026-84142 | Internally found bugs fixed in Thunderbird 155 | 9.8 | 0.0056 | None reported |
| Urgent | CVE-2026-16382 | Mitigation bypass in the DOM: Service Workers component | 9.8 | 0.0056 | None reported |
| Urgent | CVE-2026-74986 | Site isolation issue in the CSS Parsing and Computation component | 9.1 | 0.0056 | None reported |
| Urgent | CVE-2026-16388 | Sandbox escape in the DOM: Networking component | 9.8 | 0.0055 | None reported |
| Urgent | CVE-2026-16410 | JIT miscompilation in the JavaScript Engine: JIT component | 9.8 | 0.0055 | None reported |
| 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-2026-16393 | Incorrect boundary conditions in the Graphics: WebGPU component | 9.1 | 0.0054 | None reported |
| Urgent | CVE-2026-16392 | JIT miscompilation in the JavaScript Engine: JIT component | 9.1 | 0.0053 | None reported |
| Urgent | CVE-2026-92051 | Spoofing issue due to invalid pointer in the Graphics component | 9.1 | 0.0053 | None reported |
| Urgent | CVE-2026-74985 | Privilege escalation in the Enterprise Policies component | 9.8 | 0.0053 | None reported |
| Urgent | CVE-2026-16353 | Invalid pointer in the DOM: Bindings (WebIDL) component | 9.8 | 0.0052 | None reported |
| Urgent | CVE-2026-16407 | Mitigation bypass in the DOM: Service Workers component | 9.8 | 0.0051 | None reported |
Showing 1 to 25 of 259
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