| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 60.6.1< 66.0.1 | 60.6.166.0.1 |
| thunderbird | < 60.6.1 | 60.6.1 |
Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
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