CVE-2026-40092

{
  "id": "CVE-2026-40092",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40092",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-21T12:23:05.311120Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "nimiq",
          "product": "core-rs-albatross",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.4.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-05-20T22:16:36.850",
  "references": [
    {
      "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",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-252"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "nimiq-blockchain proporciona almacenamiento persistente de bloques para la implementación en Rust de Nimiq. En las versiones 1.3.0 e inferiores, un par de red malicioso puede colapsar cualquier nodo completo de Nimiq publicando un registro DHT de Kademlia manipulado. El registro manipulado maliciosamente contendría un TaggedSigned<ValidatorRecord, KeyPair> con un campo de firma cuya longitud en bytes no es exactamente 64 para causar un colapso. Cuando el verificador DHT del nodo víctima llama a TaggedSigned::verify, la ejecución llega a Ed25519Signature::from_bytes(sig).unwrap() en la implementación de TaggedPublicKey para Ed25519PublicKey. La llamada a from_bytes falla porque ed25519_zebra::Signature::try_from rechaza segmentos que no tienen 64 bytes, y el unwrap() entra en pánico. La implementación BLS de TaggedPublicKey devuelve correctamente 'false' en caso de error; solo la implementación de Ed25519 entra en pánico. Este problema ha sido solucionado en la versión 1.4.0."
    }
  ],
  "lastModified": "2026-07-23T15:10:00.137",
  "sourceIdentifier": "security-advisories@github.com"
}