ML-DSA Signature Verification Accepts Signatures with Repeated Hint Indices_CVE-2026-24850

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-01-28T00:24:53.146Z",
    "modified": "2026-01-28T00:24:53.146Z",
    "type": "cve",
    "title": "ML-DSA Signature Verification Accepts Signatures with Repeated Hint Indices",
    "source": "GitHub_M",
    "references": "https://github.com/RustCrypto/signatures/security/advisories/GHSA-5x2r-hc65-25f9\nhttps://github.com/RustCrypto/signatures/issues/894\nhttps://github.com/RustCrypto/signatures/pull/895\nhttps://github.com/RustCrypto/signatures/commit/400961412be2e2ab787942cf30e0a9b66b37a54a\nhttps://github.com/RustCrypto/signatures/commit/b01c3b73dd08d0094e089aa234f78b6089ec1f38\nhttps://csrc.nist.gov/pubs/fips/204/final\nhttps://datatracker.ietf.org/doc/html/rfc9881\nhttps://github.com/C2SP/wycheproof\nhttps://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_44_verify_test.json\nhttps://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_65_verify_test.json\nhttps://github.com/C2SP/wycheproof/blob/master/testvectors_v1/mldsa_87_verify_test.json",
    "id": "CVE-2026-24850",
    "bulletinFamily": "",
    "cwe": [
        "CWE-347"
    ],
    "cvelist": null,
    "sourceData": "RustCrypto signatures >= 0.0.4, < 0.1.0-rc.4",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "signatures",
    "version": ">= 0.0.4, < 0.1.0-rc.4",
    "vendor": "RustCrypto",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}