Mozilla Thunderbird ESR (ja) 140.3.0
Mozilla Thunderbird ESR (ja) 140.3.0, released September 17, 2025, fixes 5 CVEs in Mozilla Thunderbird ESR (ja). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Thunderbird ESR (ja) is 153.7.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Thunderbird ESR (ja) is 153.7.0, which also fixes every CVE on this page. Install that instead.
Priority of the 5 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Thunderbird ESR (ja) | 140.3.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2025-10533 | Integer overflow in the SVG component | 8.8 | 0.0078 | None reported |
| High | CVE-2025-10528 | Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component | 7.5 | 0.0037 | None reported |
| High | CVE-2025-10532 | Incorrect boundary conditions in the JavaScript: GC component | 7.5 | 0.0033 | None reported |
| High | CVE-2025-10527 | Sandbox escape due to use-after-free in the Graphics: Canvas2D component | 7.5 | 0.0029 | None reported |
| High | CVE-2025-10536 | Information disclosure in the Networking: Cache component | 7.5 | 0.0018 | None reported |
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