FKIE_CVE-2026-40092

Vulnerability from fkie_nvd - Published: 2026-05-20 22:16 - Updated: 2026-05-21 16:04
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In versions 1.3.0 and below, a malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record. The maliciously crafted record would contain a TaggedSigned<ValidatorRecord, KeyPair> with a signature field whose byte length is not exactly 64 in order to cause a crash. When the victim node's DHT verifier calls TaggedSigned::verify, execution reaches Ed25519Signature::from_bytes(sig).unwrap() in the TaggedPublicKey implementation for Ed25519PublicKey. The from_bytes call fails because ed25519_zebra::Signature::try_from rejects slices not 64 bytes, and the unwrap() panics. The BLS TaggedPublicKey implementation correctly returns false on error; only the Ed25519 implementation panics. This issue has been fixed in version 1.4.0.
References
security-advisories@github.comhttps://github.com/nimiq/core-rs-albatross/commit/807ee8e99a7ccdc604d49971f292854bfa36754d
security-advisories@github.comhttps://github.com/nimiq/core-rs-albatross/pull/3708
security-advisories@github.comhttps://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0
security-advisories@github.comhttps://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-27w2-87xv-37c6
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "nimiq-blockchain provides persistent block storage for Nimiq\u0027s Rust implementation. In versions 1.3.0 and below, a malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record. The maliciously crafted record would contain a TaggedSigned\u003cValidatorRecord, KeyPair\u003e with a signature field whose byte length is not exactly 64 in order to cause a crash. When the victim node\u0027s DHT verifier calls TaggedSigned::verify, execution reaches Ed25519Signature::from_bytes(sig).unwrap() in the TaggedPublicKey implementation for Ed25519PublicKey. The from_bytes call fails because ed25519_zebra::Signature::try_from rejects slices not 64 bytes, and the unwrap() panics. The BLS TaggedPublicKey implementation correctly returns false on error; only the Ed25519 implementation panics. This issue has been fixed in version 1.4.0."
    }
  ],
  "id": "CVE-2026-40092",
  "lastModified": "2026-05-21T16:04:53.813",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-20T22:16:36.850",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nimiq/core-rs-albatross/commit/807ee8e99a7ccdc604d49971f292854bfa36754d"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nimiq/core-rs-albatross/pull/3708"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-27w2-87xv-37c6"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-252"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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