Mozilla Thunderbird (en-US) 140.0
Mozilla Thunderbird (en-US) 140.0, released July 2, 2025, fixes 2 CVEs in Mozilla Thunderbird (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Thunderbird (en-US) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird (en-US) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 2 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird (en-US) | 140.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2025-6436 | Memory safety bugs fixed in Firefox 140 and Thunderbird 140 | 8.1 | 0.0426 | None reported |
| High | CVE-2025-6435 | Save as in Devtools could download files without sanitizing the extension | 8.1 | 0.0046 | None reported |
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