| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 76.0 | 76.0 |
| firefox esr | < 68.8.0 | 68.8.0 |
| thunderbird | < 68.8.0 | 68.8.0 |
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
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