| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 60.6.0< 66.0 | 60.6.066.0 |
| thunderbird | < 60.6.0 | 60.6.0 |
A use-after-free vulnerability can occur when the SMIL animation controller incorrectly registers with the refresh driver twice when only a single registration is expected. When a registration is later freed with the removal of the animation controller element, the refresh driver incorrectly leaves a dangling pointer to the driver's observer array. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
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