FKIE_CVE-2026-24850

Vulnerability from fkie_nvd - Published: 2026-01-28 01:16 - Updated: 2026-01-28 01:16
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
The ML-DSA crate is a Rust implementation of the Module-Lattice-Based Digital Signature Standard (ML-DSA). Starting in version 0.0.4 and prior to version 0.1.0-rc.4, the ML-DSA signature verification implementation in the RustCrypto `ml-dsa` crate incorrectly accepts signatures with repeated (duplicate) hint indices. According to the ML-DSA specification (FIPS 204 / RFC 9881), hint indices within each polynomial must be **strictly increasing**. The current implementation uses a non-strict monotonic check (`<=` instead of `<`), allowing duplicate indices. This is a regression bug. The original implementation was correct, but a commit in version 0.0.4 inadvertently changed the strict `<` comparison to `<=`, introducing the vulnerability. Version 0.1.0-rc.4 fixes the issue.
References
security-advisories@github.comhttps://csrc.nist.gov/pubs/fips/204/final
security-advisories@github.comhttps://datatracker.ietf.org/doc/html/rfc9881
security-advisories@github.comhttps://github.com/C2SP/wycheproof
security-advisories@github.comhttps://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_44_verify_test.json
security-advisories@github.comhttps://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_65_verify_test.json
security-advisories@github.comhttps://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_87_verify_test.json
security-advisories@github.comhttps://github.com/RustCrypto/signatures/commit/400961412be2e2ab787942cf30e0a9b66b37a54a
security-advisories@github.comhttps://github.com/RustCrypto/signatures/commit/b01c3b73dd08d0094e089aa234f78b6089ec1f38
security-advisories@github.comhttps://github.com/RustCrypto/signatures/issues/894
security-advisories@github.comhttps://github.com/RustCrypto/signatures/pull/895
security-advisories@github.comhttps://github.com/RustCrypto/signatures/security/advisories/GHSA-5x2r-hc65-25f9
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The ML-DSA crate is a Rust implementation of the Module-Lattice-Based Digital Signature Standard (ML-DSA). Starting in version 0.0.4 and prior to version 0.1.0-rc.4, the ML-DSA signature verification implementation in the RustCrypto `ml-dsa` crate incorrectly accepts signatures with repeated (duplicate) hint indices. According to the ML-DSA specification (FIPS 204 / RFC 9881), hint indices within each polynomial must be **strictly increasing**. The current implementation uses a non-strict monotonic check (`\u003c=` instead of `\u003c`), allowing duplicate indices. This is a regression bug. The original implementation was correct, but a commit in version 0.0.4 inadvertently changed the strict `\u003c` comparison to `\u003c=`, introducing the vulnerability. Version 0.1.0-rc.4 fixes the issue."
    }
  ],
  "id": "CVE-2026-24850",
  "lastModified": "2026-01-28T01:16:15.097",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-28T01:16:15.097",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://csrc.nist.gov/pubs/fips/204/final"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://datatracker.ietf.org/doc/html/rfc9881"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/C2SP/wycheproof"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_44_verify_test.json"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_65_verify_test.json"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_87_verify_test.json"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/RustCrypto/signatures/commit/400961412be2e2ab787942cf30e0a9b66b37a54a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/RustCrypto/signatures/commit/b01c3b73dd08d0094e089aa234f78b6089ec1f38"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/RustCrypto/signatures/issues/894"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/RustCrypto/signatures/pull/895"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/RustCrypto/signatures/security/advisories/GHSA-5x2r-hc65-25f9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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