Hybrid Encapsulation from Seed Panics on Short Seed

For a hybrid KEM public key of type `PublicKey::WingKemDraft06` or `PublicKey::X25519MlKem768Draft06`, the `PublicKey::encapsulate_derand` function would panic in an indexing operation on a seed input of length shorter than 32 bytes. # Impact Applications encapsulating with an attacker controlled seed value could be made to panic. Since the encapsulation seed should be considered a secret of the encapsulating party for the KEM to remain secure, an application should never take the seed value from a potentially attacker controlled source. # Mitigation With release of version `0.0.10` of `libcrux-kem` this bug has been fixed and the serialization functions return `InvalidPrivateKey` and `InvalidPublicKey` errors on invalid input buffer lengths. We recommend users upgrade to `libcrux-kem` version `0.0.10`.

Source published

28 Sep 2026 12:00:00 UTC

Source modified

7 Oct 2026 08:30:02 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

OSV · upstream source license applies

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CVSS_V4 · CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N