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Advisory record · GHSA-fhvh-vw7h-9xf3

libcrux-ml-dsa: Signature Verification on AVX2 Platforms Mishandles Edge Case

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 19 May 2026, 16:18 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
libcrux-ml-dsacrates.io<0.0.90.0.9
Identifiers
GHSA-fhvh-vw7h-9xf3 · RUSTSEC-2026-0125
Weakness (CWE)
CWE-347
Tags
Published
19 May 2026
Updated
20 May 2026

Machine-written summary

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

The libcrux-ml-dsa package, versions before 0.0.9, has a flaw in its AVX2 implementation of ML-DSA signature verification, where an edge case in the use_hint function is mishandled. An attacker who can supply a maliciously generated verification key could get the verifier to accept a crafted invalid signature, but only when the AVX2 code path is used. Upgrade to version 0.0.9 or later, which rejects these invalid signatures.

Written 8 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:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 15:18 UTC First seen by agentprime
  2. 31 Oct 2026, 15:18 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.