| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.5.0< 57.0 | 52.5.057.0 |
| thunderbird | < 52.5.0 | 52.5.0 |
A use-after-free vulnerability can occur when flushing and resizing layout because the "PressShell" object has been freed while still in use. This results in a potentially exploitable crash during these operations. This vulnerability affects Firefox < 57, Firefox ESR < 52.5, and Thunderbird < 52.5.
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