9.8
Critical
CVE-2026-92238 A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety…
Description
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Thunderbird 156 | earliest → < 156 | 156 |
| Thunderbird 153.3 | earliest → < 153.3 | 153.3 |
| Thunderbird 140.16 | earliest → < 140.16 | 140.16 |
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