Mozilla Thunderbird (vi) 149.0.2
Mozilla Thunderbird (vi) 149.0.2, released April 7, 2026, fixes 3 CVEs in Mozilla Thunderbird (vi). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Thunderbird (vi) is 159.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird (vi) is 159.0, which also fixes every CVE on this page. Install that instead.
Priority of the 3 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird (vi) | 149.0.2 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-5735 | Memory safety bugs fixed in Firefox 149.0.2 and Thunderbird 149.0.2 | 9.8 | 0.0027 | None reported |
| High | CVE-2026-5731 | Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 | 9.8 | 0.0035 | None reported |
| High | CVE-2026-5734 | Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 | 9.8 | 0.0034 | None reported |
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