| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.4.0< 56.0 | 52.4.056.0 |
| thunderbird | < 52.4.0 | 52.4.0 |
A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
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