| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 91.0 | 91.0 |
| firefox esr | < 78.13.0 | 78.13.0 |
| thunderbird | < 78.13.0 | 78.13.0 |
Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly considered during garbage collection. This led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
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