| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 99.0 | 99.0 |
| firefox esr | < 91.8 | 91.8 |
| thunderbird | < 91.8 | 91.8 |
By using a link with <code>rel="localization"</code> a use-after-free could have been triggered by destroying an object during JavaScript execution and then referencing the object through a freed pointer, leading to a potential exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.
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