| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 121.0 | 121.0 |
| firefox esr | < 115.6 | 115.6 |
| thunderbird | < 115.6 | 115.6 |
The `ShutdownObserver()` was susceptible to potentially undefined behavior due to its reliance on a dynamic type that lacked a virtual destructor. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.
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