GHSA-2cgv-28vr-rv6j: Libcrux intrinsics Libcrux Incorrectly Calculates On Aarch64 Vulnerability

HIGH
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CWE-327 CWE-200
Published
Advisory Summary

GHSA-2cgv-28vr-rv6j is a HIGH libcrux incorrectly calculates on aarch64 vulnerability (CWE-327: Use of a Broken or Risky Cryptographic Algorithm) affecting Libcrux intrinsics libraries in the crates.io ecosystem. The issue involves libcrux incorrectly calculates on aarch64. Remediation is available by upgrading affected packages to version 0.0.4.

GHSA-2cgv-28vr-rv6j at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-2cgv-28vr-rv6j
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-327: Use of a Broken or Risky Cryptographic Algorithm
Affected Product Libcrux intrinsics
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix GHSA-2cgv-28vr-rv6j

To remediate this vulnerability, upgrade all affected Libcrux intrinsics dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

libcrux-intrinsics fixed: 0.0.4 
Upgrade libcrux-intrinsics to 0.0.4
libcrux-ml-kem fixed: 0.0.4 
Upgrade libcrux-ml-kem to 0.0.4
libcrux-ml-dsa fixed: 0.0.4 
Upgrade libcrux-ml-dsa to 0.0.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for libcrux-intrinsics

How to Check if You Are Affected

To determine whether your application is affected by GHSA-2cgv-28vr-rv6j, inspect your project dependencies for Libcrux intrinsics:

inspect dependencies for libcrux-intrinsics

Analyze the terminal output to locate any version of Libcrux intrinsics in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-327: Use of a Broken or Risky Cryptographic Algorithm, where the product uses a broken or risky cryptographic algorithm or protocol. In Libcrux intrinsics, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

On platforms without the `core::arch::aarch64::vxarq_u64` intrinsic, an unverified fallback in `libcrux-intrinsics` v0.0.3 passed incorrect arguments and produced wrong results. This corrupted SHA-3 digests and caused `libcrux-ml-kem` and `libcrux-ml-dsa` to sample incorrectly, yielding incorrect shared secrets and invalid signatures. The issue has been fixed in v0.0.4.

GHSA-2cgv-28vr-rv6j Affected Libcrux intrinsics Versions

3 component(s)
Fixed Versions:
0.0.4
Product / Package Ecosystem Affected Versions Fixed Version
libcrux-intrinsics
 crates.io
≥ 0.0.3
< 0.0.4
All 1 versions
0.0.3
0.0.4
libcrux-ml-kem
 crates.io
≥ 0.0.3
< 0.0.4
All 1 versions
0.0.3
0.0.4
libcrux-ml-dsa
 crates.io
≥ 0.0.3
< 0.0.4
All 1 versions
0.0.3
0.0.4

References

Libcrux intrinsics Source Repository REPOSITORY
https://github.com/cryspen/libcrux/issues/1220
Libcrux intrinsics Source Repository REPOSITORY
https://github.com/cryspen/libcrux/pull/1222
Security Fix Commit FIX COMMIT
https://github.com/cryspen/libcrux/commit/8d10f45631afd1d93fabb2278dbb388a075b5608
Libcrux intrinsics Source Repository REPOSITORY
https://github.com/cryspen/libcrux
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2025-0133.html

Frequently Asked Questions

What is GHSA-2cgv-28vr-rv6j?
GHSA-2cgv-28vr-rv6j is a security vulnerability in Libcrux intrinsics involving libcrux incorrectly calculates on aarch64 under CWE-327: Use of a Broken or Risky Cryptographic Algorithm.
Which Libcrux intrinsics versions are affected?
Affected versions include releases prior to 0.0.4 across affected packages: libcrux-intrinsics, libcrux-ml-kem, libcrux-ml-dsa.
What version fixes GHSA-2cgv-28vr-rv6j?
Upgrading to 0.0.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is libcrux-intrinsics affected?
Yes, libcrux-intrinsics is affected in releases prior to 0.0.4. Upgrade your dependency to 0.0.4 or later.
Is libcrux-ml-kem affected?
Yes, libcrux-ml-kem is affected in releases prior to 0.0.4. Upgrade your dependency to 0.0.4 or later.
What CWE is associated with GHSA-2cgv-28vr-rv6j?
GHSA-2cgv-28vr-rv6j is classified under CWE-327: Use of a Broken or Risky Cryptographic Algorithm (The product uses a broken or risky cryptographic algorithm or protocol.).
How can I check crates.io dependencies for GHSA-2cgv-28vr-rv6j?
Run the dependency tree command: 'inspect dependencies for libcrux-intrinsics'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2cgv-28vr-rv6j",
  "modified" : "2026-02-17T22:00:42Z",
  "published" : "2025-12-04T17:24:23Z",
  "aliases" : [ ],
  "summary" : "libcrux incorrectly calculates on aarch64",
  "details" : "On platforms without the `core::arch::aarch64::vxarq_u64` intrinsic, an unverified fallback in `libcrux-intrinsics` v0.0.3\npassed incorrect arguments and produced wrong results. This corrupted SHA-3 digests and caused `libcrux-ml-kem` and\n`libcrux-ml-dsa` to sample incorrectly, yielding incorrect shared secrets and invalid signatures.\n\nThe issue has been fixed in v0.0.4.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "libcrux-intrinsics"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.0.3"
      }, {
        "fixed" : "0.0.4"
      } ]
    } ],
    "versions" : [ "0.0.3" ]
  }, {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "libcrux-ml-kem"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.0.3"
      }, {
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    } ],
    "versions" : [ "0.0.3" ]
  }, {
    "package" : {
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      "name" : "libcrux-ml-dsa"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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        "introduced" : "0.0.3"
      }, {
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      } ]
    } ],
    "versions" : [ "0.0.3" ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cryspen/libcrux/issues/1220"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cryspen/libcrux/pull/1222"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cryspen/libcrux/commit/8d10f45631afd1d93fabb2278dbb388a075b5608"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cryspen/libcrux"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2025-0133.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-327" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-04T17:24:23Z",
    "nvd_published_at" : null
  }
}