| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 65.0 | 65.0 |
| firefox esr | < 60.5 | 60.5 |
| thunderbird | < 60.5 | 60.5 |
A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements. This results in the stream parser object being freed while still in use, leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.
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