PT-2026-95567

Summary When pqc kyber is built with the opt-in avx2 feature on x86 64, its constant-time conditional-move routine cmov is a no-op: it never performs the copy. That cmov is exactly the step that applies the Fujisaki-Okamoto FO implicit rejection during decapsulation. With it disabled, decapsulati...

PT-2026-95566

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 cmov is the step that applies the Fujisaki-Okamoto F...