| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 133.0 | 133.0 |
| thunderbird | < 133.0 | 133.0 |
`NSC_DeriveKey` inadvertently assumed that the `phKey` parameter is always non-NULL. When it was passed as NULL, a segmentation fault (SEGV) occurred, leading to crashes. This behavior conflicted with the PKCS#11 v3.0 specification, which allows `phKey` to be NULL for certain mechanisms. This vulnerability affects Firefox < 133 and Thunderbird < 133.
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