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Advisory record · RUSTSEC-2026-0330

Hybrid Encapsulation from Seed Panics on Short Seed

CVSS 4.0, no score published

Published by OSV at 28 Sept 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
libcrux-kemcrates.io>=0.0.0-0, <0.0.100.0.10
Identifiers
RUSTSEC-2026-0330
Published
28 Sept 2026
Updated
7 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

libcrux-kem versions before 0.0.10 can panic when the PublicKey::encapsulate_derand function is called with a seed shorter than 32 bytes on a hybrid KEM public key of type WingKemDraft06 or X25519MlKem768Draft06. An attacker would need to control the seed value used for encapsulation, which causes the application to panic. Upgrade libcrux-kem to version 0.0.10, and do not take the encapsulation seed from an untrusted source.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
Not published None 4.0 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 OSV
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.