CVE-2026-59695

{
  "id": "CVE-2026-59695",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-07-17T11:17:14.117",
  "lastModified": "2026-10-24T20:10:00.137",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to drain the fee-payer wallet in a single request by naming an arbitrarily high gas price.\n\nWhen the mpp Elixir library is configured as fee payer (fee_payer: true), MPP.Tempo.Transaction.cosign_fee_payer/3 re-signs the client-supplied base fields of the 0x76 AASigned envelope verbatim, including max_fee_per_gas and max_priority_fee_per_gas, without validating that they are within reasonable bounds. A malicious client embeds arbitrarily large values for these fields in the signed envelope. The server co-signs and broadcasts the transaction. The effective_gas_price billed against the fee-payer wallet is derived from the attacker-supplied ceilings, so the server pays those inflated per-gas rates out of its own wallet. A single crafted request can drain the wallet entirely, after which the server can no longer sponsor gas for legitimate payment requests.\n\nThis issue affects mpp: from 0.2.0 before 0.6.0."
    },
    {
      "lang": "es",
      "value": "Validación Incorrecta de Cantidad Especificada en la Entrada en ZenHive mpp permite a un cliente remoto no autenticado vaciar la billetera del pagador de tarifas en una sola solicitud al nombrar un precio de gas arbitrariamente alto.\n\nCuando la biblioteca mpp Elixir está configurada como pagador de tarifas (fee_payer: true), MPP.Tempo.Transaction.cosign_fee_payer/3 vuelve a firmar los campos base proporcionados por el cliente del sobre 0x76 AASigned textualmente, incluyendo max_fee_per_gas y max_priority_fee_per_gas, sin validar que estén dentro de límites razonables. Un cliente malicioso incrusta valores arbitrariamente grandes para estos campos en el sobre firmado. El servidor co-firma y transmite la transacción. El effective_gas_price facturado a la billetera del pagador de tarifas se deriva de los techos proporcionados por el atacante, por lo que el servidor paga esas tarifas por gas infladas de su propia billetera. Una única solicitud manipulada puede vaciar la billetera por completo, después de lo cual el servidor ya no puede patrocinar gas para solicitudes de pago legítimas.\n\nEste problema afecta a mpp: desde 0.2.0 antes de 0.6.0."
    }
  ],
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "vendor": "ZenHive",
          "product": "mpp",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.hex.pm",
          "packageName": "mpp",
          "cpes": [
            "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "'Elixir.MPP.Tempo.Transaction'"
          ],
          "programFiles": [
            "lib/mpp/tempo/transaction.ex"
          ],
          "programRoutines": [
            {
              "name": "'Elixir.MPP.Tempo.Transaction':cosign_fee_payer/3"
            }
          ],
          "repo": "https://github.com/ZenHive/mpp",
          "packageURL": "pkg:hex/mpp",
          "versions": [
            {
              "version": "0.2.0",
              "lessThan": "0.6.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "ZenHive",
          "product": "mpp",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com",
          "packageName": "ZenHive/mpp",
          "cpes": [
            "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "'Elixir.MPP.Tempo.Transaction'"
          ],
          "programFiles": [
            "lib/mpp/tempo/transaction.ex"
          ],
          "programRoutines": [
            {
              "name": "'Elixir.MPP.Tempo.Transaction':cosign_fee_payer/3"
            }
          ],
          "repo": "https://github.com/ZenHive/mpp",
          "packageURL": "pkg:github/ZenHive/mpp",
          "versions": [
            {
              "version": "d29d54e507918db00a5b65d90136b73166c017d7",
              "lessThan": "5d6338e2334084c5f2a78cfcca474830733ed7e8",
              "versionType": "git",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 8.3,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-17T12:53:10.647332Z",
          "id": "CVE-2026-59695",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1284"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-59695.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ZenHive/mpp/commit/5d6338e2334084c5f2a78cfcca474830733ed7e8",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-vv77-66rf-pm86",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59695",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-vv77-66rf-pm86",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}