| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 45.8.0< 52.0 | 45.8.052.0 |
| thunderbird | < 45.8.0 | 45.8.0 |
A use-after-free can occur when events are fired for a "FontFace" object after the object has been already been destroyed while working with fonts. This results in a potentially exploitable crash. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.
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