| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 60.6.0< 66.0 | 60.6.066.0 |
| thunderbird | < 60.6.0 | 60.6.0 |
The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR). This allows for possible arbitrary reading and writing of objects during an exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
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