{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-22698",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-01-08T19:23:09.856Z",
        "datePublished": "2026-01-10T05:17:19.993Z",
        "dateUpdated": "2026-01-12T16:48:30.706Z"
    },
    "containers": {
        "cna": {
            "title": "RustCrypto SM2-PKE has 32-bit Biased Nonce Vulnerability",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-331",
                            "lang": "en",
                            "description": "CWE-331: Insufficient Entropy",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.7,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-w3g8-fp6j-wvqw",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-w3g8-fp6j-wvqw"
                },
                {
                    "name": "https://github.com/RustCrypto/elliptic-curves/pull/1600",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/RustCrypto/elliptic-curves/pull/1600"
                },
                {
                    "name": "https://github.com/RustCrypto/elliptic-curves/commit/4781762f23ff22ab34763410f648128055c93731",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/RustCrypto/elliptic-curves/commit/4781762f23ff22ab34763410f648128055c93731"
                },
                {
                    "name": "https://github.com/RustCrypto/elliptic-curves/commit/e4f77788130d065d760e57fb109370827110a525",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/RustCrypto/elliptic-curves/commit/e4f77788130d065d760e57fb109370827110a525"
                },
                {
                    "name": "https://crates.io/crates/sm2/0.14.0-pre.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://crates.io/crates/sm2/0.14.0-pre.0"
                },
                {
                    "name": "https://crates.io/crates/sm2/0.14.0-rc.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://crates.io/crates/sm2/0.14.0-rc.0"
                }
            ],
            "affected": [
                {
                    "vendor": "RustCrypto",
                    "product": "elliptic-curves",
                    "versions": [
                        {
                            "version": "= 0.14.0-pre.0",
                            "status": "affected"
                        },
                        {
                            "version": "= 0.14.0-rc.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-01-10T05:17:19.993Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "RustCrypto: Elliptic Curves is general purpose Elliptic Curve Cryptography (ECC) support, including types and traits for representing various elliptic curve forms, scalars, points, and public/secret keys composed thereof. In versions 0.14.0-pre.0 and 0.14.0-rc.0, a  critical vulnerability exists in the SM2 Public Key Encryption (PKE) implementation where the ephemeral nonce k is generated with severely reduced entropy. A unit mismatch error causes the nonce generation function to request only 32 bits of randomness instead of the expected 256 bits. This reduces the security of the encryption from a 128-bit level to a trivial 16-bit level, allowing a practical attack to recover the nonce k and decrypt any ciphertext given only the public key and ciphertext. This issue has been patched via commit e4f7778."
                }
            ],
            "source": {
                "advisory": "GHSA-w3g8-fp6j-wvqw",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-01-12T16:47:49.756087Z",
                                "id": "CVE-2026-22698",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-01-12T16:48:30.706Z"
                }
            }
        ]
    }
}