| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 93.0 | 93.0 |
| firefox esr | < 91.3.0 | 91.3.0 |
| thunderbird | < 91.3.0 | 91.3.0 |
A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.
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