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🛡️ GHSA-fhvh-vw7h-9xf3 — libcrux-ml-dsa

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-347 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

The AVX2 implementation of ML-DSA verification incorrectly implemented

the use_hint function, mishandling an edge case that should lead to

signature rejection.

Impact

An attacker could make the ML-DSA verifier accept a crafted invalid

signature under a maliciously generated verification key, if the AVX2

implementation is used.

Mitigation

From version 0.0.9 the edge case is handled correctly and invalid

signatures are rejected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity high, availability none.

Weakness class

GHSA-fhvh-vw7h-9xf3 is classified as CWE-347: Improper Verification of Cryptographic Signature. A signature is not checked correctly, so forged or modified content is accepted as genuine.

Affected software

GHSA-fhvh-vw7h-9xf3 is recorded against 1 package.

  • libcrux-ml-dsa

Timeline and source

Published on 19 May 2026 and last revised on 20 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
rustsec.org (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector 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
CWE CWE-347
Public Exploit ✅ No
Source OSV
Published 2026-05-19
Updated 2026-08-20
Modified 2026-05-20
Fix URL N/A

Affected Packages

Software From version Fixed in
libcrux-ml-dsa — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.