| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 60.6.0< 66.0 | 60.6.066.0 |
| thunderbird | < 60.6.0 | 60.6.0 |
The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
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