| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 91.0 | 91.0 |
| thunderbird | < 91.0 | 91.0 |
An issue present in lowering/register allocation could have led to obscure but deterministic register confusion failures in JITted code that would lead to a potentially exploitable crash. This vulnerability affects Firefox < 91 and Thunderbird < 91.
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