Mozilla Thunderbird (de) 152.0
Mozilla Thunderbird (de) 152.0, released June 16, 2026, fixes 40 CVEs in Mozilla Thunderbird (de). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird (de) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird (de) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 40 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird (de) | 152.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-12295 | Sandbox escape in the DOM: Navigation component | 9.6 | 0.0039 | None reported |
| Urgent | CVE-2026-12296 | Sandbox escape in the Security: Process Sandboxing component | 9.6 | 0.0039 | None reported |
| Urgent | CVE-2026-12297 | Sandbox escape due to incorrect boundary conditions in the Networking component | 9.6 | 0.0039 | None reported |
| Urgent | CVE-2026-12294 | Sandbox escape in the DOM: Workers component | 9.6 | 0.0036 | None reported |
| Urgent | CVE-2026-12293 | Use-after-free in the Graphics: WebGPU component | 9.8 | 0.0030 | None reported |
| Urgent | CVE-2026-12315 | Mitigation bypass in the DOM: Security component | 9.1 | 0.0025 | None reported |
| Urgent | CVE-2026-12316 | Mitigation bypass in the DOM: Security component | 9.1 | 0.0025 | None reported |
| Urgent | CVE-2026-12304 | Same-origin policy bypass in the Networking: Cookies component | 9.1 | 0.0019 | None reported |
| High | CVE-2026-12292 | Incorrect boundary conditions in the Web Audio component | 8.1 | 0.0049 | None reported |
| High | CVE-2026-12328 | Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 | 8.1 | 0.0048 | None reported |
| High | CVE-2026-12327 | Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 | 8.1 | 0.0041 | None reported |
| High | CVE-2026-12290 | Memory safety bug fixed in Thunderbird 152 | 8.1 | 0.0040 | None reported |
| High | CVE-2026-12289 | Privilege escalation in the Graphics: WebRender component | 8.8 | 0.0040 | None reported |
| High | CVE-2026-12291 | Use-after-free in the Networking: HTTP component | 8.8 | 0.0038 | None reported |
| High | CVE-2026-12305 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0037 | None reported |
| High | CVE-2026-12326 | Memory safety bugs fixed in Firefox 152 and Thunderbird 152 | 8.1 | 0.0036 | None reported |
| High | CVE-2026-12298 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0031 | None reported |
| High | CVE-2026-12299 | JIT miscompilation in the DOM: Core & HTML component | 7.5 | 0.0031 | None reported |
| High | CVE-2026-12317 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0029 | None reported |
| High | CVE-2026-12318 | Incorrect boundary conditions in the Libraries component in NSS | 7.3 | 0.0026 | None reported |
| High | CVE-2026-12306 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0026 | None reported |
| High | CVE-2026-12307 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0026 | None reported |
| High | CVE-2026-12308 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0026 | None reported |
| High | CVE-2026-12310 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0025 | None reported |
| High | CVE-2026-12312 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0025 | None reported |
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