| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.6.0< 58.0 | 52.6.058.0 |
| thunderbird | < 52.6.0 | 52.6.0 |
A use-after-free vulnerability can occur during font face manipulation when a font face is freed while still in use, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.6, Firefox ESR < 52.6, and Firefox < 58.
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