| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 67.0 | 67.0 |
| firefox esr | < 60.7 | 60.7 |
| thunderbird | < 60.7 | 60.7 |
A use-after-free vulnerability can occur when working with XMLHttpRequest (XHR) in an event loop, causing the XHR main thread to be called after it has been freed. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
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