RUSTSEC-2026-0287 cosmian_kyber is unmaintained

cosmiankyber 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/kyber6 has gone unanswered. Recommended alternatives: - aws-lc-rs - graviola...

cosmian_kyber is unmaintained

cosmiankyber 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/kyber6 has gone unanswered. Recommended alternatives: - aws-lc-rs - graviola...

RUSTSEC-2026-0288 cosmian_kyber: AVX2 backend skips Fujisaki-Okamoto implicit rejection, enabling chosen-ciphertext key recovery

Summary cosmiankyber 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 x8664, cmov is a no-op: it never performs the copy. That cmov is the step that applies the Fujisaki-Okamoto FO...

cosmian_kyber: AVX2 backend skips Fujisaki-Okamoto implicit rejection, enabling chosen-ciphertext key recovery

Summary cosmiankyber 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 x8664, cmov is a no-op: it never performs the copy. That cmov is the step that applies the Fujisaki-Okamoto FO...