| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.2.0< 54.0 | 52.2.054.0 |
| thunderbird | < 52.2.0 | 52.2.0 |
A use-after-free vulnerability with the frameloader during tree reconstruction while regenerating CSS layout when attempting to use a node in the tree that no longer exists. This results in a potentially exploitable crash. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.
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