Vulnerability-Lookup

CVE-2026-59694 (GCVE-0-2026-59694)

Vulnerability from cvelistv5 – Published: 2026-07-17 10:11 – Updated: 2026-07-18 04:12

Title

Unbounded access list in mpp Tempo fee-payer inflates gas cost per payment

Summary

Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer's gas cost per payment by a large multiplier, degrading the sponsor's operating margin. When 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 the EIP-2930 access list, without validating its length or contents. EIP-2930 access list entries incur intrinsic gas (~2,400 gas per address, plus 1,900 gas per storage key) charged before any opcode executes, regardless of whether the listed addresses are ever touched. A malicious client submits a valid transferWithMemo call alongside a large number of fabricated access-list entries. The server co-signs and broadcasts the transaction. The intended transfer executes normally, but the fee-payer wallet pays a large multiple of the expected gas cost with no corresponding on-chain work. At the maintainer's default of 137 access-list entries (fitting within Bandit's 10,000-byte per-header-field limit) and 100 Gwei max_fee_per_gas, per-payment gas cost rises from ~51,287 to ~380,087 gas, a 7.4x multiplier. Sustained abuse destroys the sponsor's operating margin on low-cost payments and, over time, drains the fee-payer wallet. This issue affects mpp: from 0.2.0 before 0.6.0.

Severity

8.3 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 12:22 UTC

CWE

CWE-1284 - Improper Validation of Specified Quantity in Input

Assigner

EEF CNA under the mitre root

CNA scorecard A 97/100 over 350 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/ZenHive/mpp/security/advisorie…	vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-59694.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-59694	related
https://github.com/ZenHive/mpp/commit/5d6338e2334…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
ZenHive	mpp	Affected: 0.2.0 , < 0.6.0 (semver) cpe:2.3:a:ZenHive:mpp::::::::
ZenHive	mpp	Affected: d29d54e507918db00a5b65d90136b73166c017d7 , < 5d6338e2334084c5f2a78cfcca474830733ed7e8 (git) cpe:2.3:a:ZenHive:mpp::::::::

Credits

Kian Kai Ang E.FU Jonatan Männchen / EEF

Show details on NVD website

JSON

To clipboard

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          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-1284"
              }
            ],
            "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-59694",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-17T12:22:40.105353Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-17T12:22:35.614Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-qpxh-ff8m-c62v"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "collectionURL": "https://repo.hex.pm",
              "cpes": [
                "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.MPP.Tempo.Transaction\u0027"
              ],
              "packageName": "mpp",
              "packageURL": "pkg:hex/mpp",
              "product": "mpp",
              "programFiles": [
                "lib/mpp/tempo/transaction.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.MPP.Tempo.Transaction\u0027:cosign_fee_payer/3"
                }
              ],
              "repo": "https://github.com/ZenHive/mpp",
              "vendor": "ZenHive",
              "versions": [
                {
                  "lessThan": "0.6.0",
                  "status": "affected",
                  "version": "0.2.0",
                  "versionType": "semver"
                }
              ]
            },
            {
              "collectionURL": "https://github.com",
              "cpes": [
                "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.MPP.Tempo.Transaction\u0027"
              ],
              "packageName": "ZenHive/mpp",
              "packageURL": "pkg:github/ZenHive/mpp",
              "product": "mpp",
              "programFiles": [
                "lib/mpp/tempo/transaction.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.MPP.Tempo.Transaction\u0027:cosign_fee_payer/3"
                }
              ],
              "repo": "https://github.com/ZenHive/mpp",
              "vendor": "ZenHive",
              "versions": [
                {
                  "lessThan": "5d6338e2334084c5f2a78cfcca474830733ed7e8",
                  "status": "affected",
                  "version": "d29d54e507918db00a5b65d90136b73166c017d7",
                  "versionType": "git"
                }
              ]
            }
          ],
          "configurations": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eThe vulnerable code path is only reachable when the \u003ctt\u003eMPP.Methods.Tempo\u003c/tt\u003e method is configured with \u003ctt\u003efee_payer: true\u003c/tt\u003e (server-side gas sponsorship). Default deployments with \u003ctt\u003efee_payer: false\u003c/tt\u003e are not affected, since the client pays for gas out of its own wallet.\u003c/p\u003e"
                }
              ],
              "value": "The vulnerable code path is only reachable when the MPP.Methods.Tempo method is configured with fee_payer: true (server-side gas sponsorship). Default deployments with fee_payer: false are not affected, since the client pays for gas out of its own wallet."
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "0.6.0",
                      "versionStartIncluding": "0.2.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "AND"
                }
              ],
              "operator": "OR"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Kian Kai Ang"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "E.FU"
            },
            {
              "lang": "en",
              "type": "analyst",
              "value": "Jonatan M\u00e4nnchen / EEF"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eImproper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer\u0027s gas cost per payment by a large multiplier, degrading the sponsor\u0027s operating margin.\u003c/p\u003e\u003cp\u003eWhen the \u003ctt\u003empp\u003c/tt\u003e Elixir library is configured as fee payer (\u003ctt\u003efee_payer: true\u003c/tt\u003e), \u003ctt\u003eMPP.Tempo.Transaction.cosign_fee_payer/3\u003c/tt\u003e re-signs the client-supplied base fields of the \u003ctt\u003e0x76\u003c/tt\u003e AASigned envelope verbatim, including the EIP-2930 access list, without validating its length or contents. EIP-2930 access list entries incur intrinsic gas (~2,400 gas per address, plus 1,900 gas per storage key) charged before any opcode executes, regardless of whether the listed addresses are ever touched. A malicious client submits a valid \u003ctt\u003etransferWithMemo\u003c/tt\u003e call alongside a large number of fabricated access-list entries. The server co-signs and broadcasts the transaction. The intended transfer executes normally, but the fee-payer wallet pays a large multiple of the expected gas cost with no corresponding on-chain work.\u003c/p\u003e\u003cp\u003eAt the maintainer\u0027s default of 137 access-list entries (fitting within Bandit\u0027s 10,000-byte per-header-field limit) and 100 Gwei \u003ctt\u003emax_fee_per_gas\u003c/tt\u003e, per-payment gas cost rises from ~51,287 to ~380,087 gas, a 7.4x multiplier. Sustained abuse destroys the sponsor\u0027s operating margin on low-cost payments and, over time, drains the fee-payer wallet.\u003c/p\u003e\u003cp\u003eThis issue affects mpp: from 0.2.0 before 0.6.0.\u003c/p\u003e"
                }
              ],
              "value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer\u0027s gas cost per payment by a large multiplier, degrading the sponsor\u0027s operating margin.\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 the EIP-2930 access list, without validating its length or contents. EIP-2930 access list entries incur intrinsic gas (~2,400 gas per address, plus 1,900 gas per storage key) charged before any opcode executes, regardless of whether the listed addresses are ever touched. A malicious client submits a valid transferWithMemo call alongside a large number of fabricated access-list entries. The server co-signs and broadcasts the transaction. The intended transfer executes normally, but the fee-payer wallet pays a large multiple of the expected gas cost with no corresponding on-chain work.\n\nAt the maintainer\u0027s default of 137 access-list entries (fitting within Bandit\u0027s 10,000-byte per-header-field limit) and 100 Gwei max_fee_per_gas, per-payment gas cost rises from ~51,287 to ~380,087 gas, a 7.4x multiplier. Sustained abuse destroys the sponsor\u0027s operating margin on low-cost payments and, over time, drains the fee-payer wallet.\n\nThis issue affects mpp: from 0.2.0 before 0.6.0."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-130",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-130 Excessive Allocation"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 8.3,
                "baseSeverity": "HIGH",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "HIGH"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-1284",
                  "description": "CWE-1284 Improper Validation of Specified Quantity in Input",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-18T04:12:36.335Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "related"
              ],
              "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-qpxh-ff8m-c62v"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-59694.html"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59694"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/ZenHive/mpp/commit/5d6338e2334084c5f2a78cfcca474830733ed7e8"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Unbounded access list in mpp Tempo fee-payer inflates gas cost per payment",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-59694",
        "datePublished": "2026-07-17T10:11:49.192Z",
        "dateReserved": "2026-07-06T14:05:47.003Z",
        "dateUpdated": "2026-07-18T04:12:36.335Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-59694

Vulnerability from fkie_nvd - Published: 2026-07-17 11:17 - Updated: 2026-10-24 20:10

Severity

8.3 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-59694.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ZenHive/mpp/commit/5d6338e2334084c5f2a78cfcca474830733ed7e8
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ZenHive/mpp/security/advisories/GHSA-qpxh-ff8m-c62v
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-59694
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/ZenHive/mpp/security/advisories/GHSA-qpxh-ff8m-c62v

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.MPP.Tempo.Transaction\u0027"
          ],
          "packageName": "mpp",
          "packageURL": "pkg:hex/mpp",
          "product": "mpp",
          "programFiles": [
            "lib/mpp/tempo/transaction.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.MPP.Tempo.Transaction\u0027:cosign_fee_payer/3"
            }
          ],
          "repo": "https://github.com/ZenHive/mpp",
          "vendor": "ZenHive",
          "versions": [
            {
              "lessThan": "0.6.0",
              "status": "affected",
              "version": "0.2.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.MPP.Tempo.Transaction\u0027"
          ],
          "packageName": "ZenHive/mpp",
          "packageURL": "pkg:github/ZenHive/mpp",
          "product": "mpp",
          "programFiles": [
            "lib/mpp/tempo/transaction.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.MPP.Tempo.Transaction\u0027:cosign_fee_payer/3"
            }
          ],
          "repo": "https://github.com/ZenHive/mpp",
          "vendor": "ZenHive",
          "versions": [
            {
              "lessThan": "5d6338e2334084c5f2a78cfcca474830733ed7e8",
              "status": "affected",
              "version": "d29d54e507918db00a5b65d90136b73166c017d7",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer\u0027s gas cost per payment by a large multiplier, degrading the sponsor\u0027s operating margin.\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 the EIP-2930 access list, without validating its length or contents. EIP-2930 access list entries incur intrinsic gas (~2,400 gas per address, plus 1,900 gas per storage key) charged before any opcode executes, regardless of whether the listed addresses are ever touched. A malicious client submits a valid transferWithMemo call alongside a large number of fabricated access-list entries. The server co-signs and broadcasts the transaction. The intended transfer executes normally, but the fee-payer wallet pays a large multiple of the expected gas cost with no corresponding on-chain work.\n\nAt the maintainer\u0027s default of 137 access-list entries (fitting within Bandit\u0027s 10,000-byte per-header-field limit) and 100 Gwei max_fee_per_gas, per-payment gas cost rises from ~51,287 to ~380,087 gas, a 7.4x multiplier. Sustained abuse destroys the sponsor\u0027s operating margin on low-cost payments and, over time, drains the fee-payer wallet.\n\nThis issue affects mpp: from 0.2.0 before 0.6.0."
    },
    {
      "lang": "es",
      "value": "Validaci\u00f3n incorrecta de la cantidad especificada en la entrada en ZenHive mpp permite a un cliente remoto no autenticado inflar el costo de gas por pago del pagador de tarifas por un gran multiplicador, degradando el margen operativo del patrocinador.\n\nCuando la biblioteca Elixir mpp est\u00e1 configurada como pagador de tarifas (fee_payer: true), MPP.Tempo.Transaction.cosign_fee_payer/3 vuelve a firmar los campos base suministrados por el cliente del sobre 0x76 AASigned textualmente, incluyendo la lista de acceso EIP-2930, sin validar su longitud o contenido. Las entradas de la lista de acceso EIP-2930 incurren en gas intr\u00ednseco (~2.400 gas por direcci\u00f3n, m\u00e1s 1.900 gas por clave de almacenamiento) cobrado antes de que se ejecute cualquier c\u00f3digo de operaci\u00f3n, independientemente de si las direcciones listadas se tocan alguna vez. Un cliente malicioso env\u00eda una llamada transferWithMemo v\u00e1lida junto con un gran n\u00famero de entradas de lista de acceso fabricadas. El servidor co-firma y transmite la transacci\u00f3n. La transferencia prevista se ejecuta normalmente, pero la billetera del pagador de tarifas paga un gran m\u00faltiplo del costo de gas esperado sin trabajo en cadena correspondiente.\n\nCon el valor predeterminado del mantenedor de 137 entradas de lista de acceso (encajando dentro del l\u00edmite de 10.000 bytes por campo de encabezado de Bandit) y 100 Gwei max_fee_per_gas, el costo de gas por pago aumenta de ~51.287 a ~380.087 gas, un multiplicador de 7,4x. El abuso sostenido destruye el margen operativo del patrocinador en pagos de bajo costo y, con el tiempo, agota la billetera del pagador de tarifas.\n\nEste problema afecta a mpp: desde 0.2.0 antes de 0.6.0."
    }
  ],
  "id": "CVE-2026-59694",
  "lastModified": "2026-10-24T20:10:00.137",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.3,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-59694",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-17T12:22:40.105353Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-17T11:17:13.960",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-59694.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-qpxh-ff8m-c62v"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59694"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-qpxh-ff8m-c62v"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1284"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

GHSA-R4HX-MHRP-XF73

Vulnerability from github – Published: 2026-07-17 12:31 – Updated: 2026-07-17 12:31

Details

When 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 the EIP-2930 access list, without validating its length or contents. EIP-2930 access list entries incur intrinsic gas (~2,400 gas per address, plus 1,900 gas per storage key) charged before any opcode executes, regardless of whether the listed addresses are ever touched. A malicious client submits a valid transferWithMemo call alongside a large number of fabricated access-list entries. The server co-signs and broadcasts the transaction. The intended transfer executes normally, but the fee-payer wallet pays a large multiple of the expected gas cost with no corresponding on-chain work.

At the maintainer's default of 137 access-list entries (fitting within Bandit's 10,000-byte per-header-field limit) and 100 Gwei max_fee_per_gas, per-payment gas cost rises from ~51,287 to ~380,087 gas, a 7.4x multiplier. Sustained abuse destroys the sponsor's operating margin on low-cost payments and, over time, drains the fee-payer wallet.

This issue affects mpp: from 0.2.0 before 0.6.0.

Severity

8.3 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-59694"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1284"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-17T11:17:13Z",
    "severity": "HIGH"
  },
  "details": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to inflate the fee-payer\u0027s gas cost per payment by a large multiplier, degrading the sponsor\u0027s operating margin.\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 the EIP-2930 access list, without validating its length or contents. EIP-2930 access list entries incur intrinsic gas (~2,400 gas per address, plus 1,900 gas per storage key) charged before any opcode executes, regardless of whether the listed addresses are ever touched. A malicious client submits a valid transferWithMemo call alongside a large number of fabricated access-list entries. The server co-signs and broadcasts the transaction. The intended transfer executes normally, but the fee-payer wallet pays a large multiple of the expected gas cost with no corresponding on-chain work.\n\nAt the maintainer\u0027s default of 137 access-list entries (fitting within Bandit\u0027s 10,000-byte per-header-field limit) and 100 Gwei max_fee_per_gas, per-payment gas cost rises from ~51,287 to ~380,087 gas, a 7.4x multiplier. Sustained abuse destroys the sponsor\u0027s operating margin on low-cost payments and, over time, drains the fee-payer wallet.\n\nThis issue affects mpp: from 0.2.0 before 0.6.0.",
  "id": "GHSA-r4hx-mhrp-xf73",
  "modified": "2026-07-17T12:31:29Z",
  "published": "2026-07-17T12:31:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-qpxh-ff8m-c62v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59694"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ZenHive/mpp/commit/5d6338e2334084c5f2a78cfcca474830733ed7e8"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-59694.html"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59694"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-59694 (GCVE-0-2026-59694)

FKIE_CVE-2026-59694

GHSA-R4HX-MHRP-XF73

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