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Unscored —
cosmian_kyber is unmaintained
`cosmian_kyber` is a fork of `Argyle-Software/kyber` that has seen no maintainer activity. It inherits the fork parent's broken AVX2 constant-time code, and the open fix pull request (Cosmian/kyber#6) has gone unanswered. Recommended alternatives: - [aws-lc-r…
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High 7.4
cosmian_kyber: AVX2 backend skips Fujisaki-Okamoto implicit rejection, enabling chosen-ciphertext key recovery
## Summary `cosmian_kyber` is a fork of `Argyle-Software/kyber` and inherits a broken constant-time conditional-move routine `cmov` in its AVX2 backend. When built with the opt-in `avx2` feature on x86_64, `cmov` is a no-op: it never performs the copy. That `…