CVE-2026-44500

{
  "id": "CVE-2026-44500",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-08T15:17:01.777",
  "lastModified": "2026-10-26T18:10:00.173",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0, prior to zebra-chain version 7.0.0, and prior to zebra-network version 6.0.0, several inbound deserialization paths in Zebra allocated buffers sized against generic transport or block-size ceilings before the tighter protocol or consensus limits were enforced. An unauthenticated or post-handshake peer could therefore force the node to preallocate and parse for orders of magnitude more data than the protocol intended, across headers messages, equihash solutions in block headers, Sapling spend vectors in V5/V4 transactions, and coinbase script bytes in blocks. This issue has been patched in zebrad version 4.4.0, zebra-chain version 7.0.0, and zebra-network version 6.0.0."
    },
    {
      "lang": "es",
      "value": "ZEBRA es un nodo de Zcash escrito completamente en Rust. Antes de la versión 4.4.0 de zebrad, antes de la versión 7.0.0 de zebra-chain, y antes de la versión 6.0.0 de zebra-network, varias rutas de deserialización entrantes en Zebra asignaban búferes dimensionados contra límites máximos genéricos de transporte o de tamaño de bloque antes de que se aplicaran los límites más estrictos del protocolo o del consenso. Un par no autenticado o posterior al handshake podría, por lo tanto, forzar al nodo a preasignar y analizar órdenes de magnitud más datos de lo que el protocolo pretendía, a través de mensajes de cabeceras, soluciones equihash en cabeceras de bloque, vectores de gasto Sapling en transacciones V5/V4, y bytes de script de coinbase en bloques. Este problema ha sido parcheado en la versión 4.4.0 de zebrad, la versión 7.0.0 de zebra-chain, y la versión 6.0.0 de zebra-network."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "ZcashFoundation",
          "product": "zebra",
          "versions": [
            {
              "version": "zebrad < 4.4.0",
              "status": "affected"
            },
            {
              "version": "zebra-chain < 7.0.0",
              "status": "affected"
            },
            {
              "version": "zebra-network < 6.0.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-08T19:41:23.974951Z",
          "id": "CVE-2026-44500",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:zfnd:zebra-chain:*:*:*:*:*:rust:*:*",
              "versionEndExcluding": "7.0.0",
              "matchCriteriaId": "6BF3BDC0-FD8D-4265-B8BC-139BF28710E2"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:zfnd:zebra-network:*:*:*:*:*:rust:*:*",
              "versionEndExcluding": "6.0.0",
              "matchCriteriaId": "8E807203-EE55-46B2-8CD1-29047653BCFF"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:zfnd:zebrad:*:*:*:*:*:rust:*:*",
              "versionEndExcluding": "4.4.0",
              "matchCriteriaId": "23232F98-CB60-4B90-B46A-430E3E1CE10B"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-438q-jx8f-cccv",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}