9.8
Critical
CVE-2026-16412 Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152
Description
Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 153 | earliest → < 153 | 153 |
| Firefox 140.13 | earliest → < 140.13 | 140.13 |
| Thunderbird 153 | earliest → < 153 | 153 |
| Thunderbird 140.13 | earliest → < 140.13 | 140.13 |
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