| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 84.0 | 84.0 |
| firefox esr | < 78.6.0 | 78.6.0 |
| thunderbird | < 78.6.0 | 78.6.0 |
When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
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