| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.3.0< 55.0 | 52.3.055.0 |
| thunderbird | < 52.3.0 | 52.3.0 |
An out-of-bounds read occurs when applying style rules to pseudo-elements, such as ::first-line, using cached style data. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
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