{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59252", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-07-04T04:24:03.653Z", "datePublished": "2026-07-17T10:11:54.436Z", "dateUpdated": "2026-07-17T10:11:54.436Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.MPP.Methods.Tempo'"], "packageName": "mpp", "packageURL": "pkg:hex/mpp", "product": "mpp", "programFiles": ["lib/mpp/methods/tempo.ex"], "programRoutines": [{"name": "'Elixir.MPP.Methods.Tempo':broadcast_and_verify/7"}], "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": ["'Elixir.MPP.Methods.Tempo'"], "packageName": "ZenHive/mpp", "packageURL": "pkg:github/ZenHive/mpp", "product": "mpp", "programFiles": ["lib/mpp/methods/tempo.ex"], "programRoutines": [{"name": "'Elixir.MPP.Methods.Tempo':broadcast_and_verify/7"}], "repo": "https://github.com/ZenHive/mpp", "vendor": "ZenHive", "versions": [{"lessThan": "d84e3e528db39654540c2035ea0fbdf7b950d3d1", "status": "affected", "version": "d29d54e507918db00a5b65d90136b73166c017d7", "versionType": "git"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The vulnerable code path is only reachable when the <tt>MPP.Methods.Tempo</tt> method is configured with <tt>fee_payer: true</tt> (server-side gas sponsorship). Default deployments with <tt>fee_payer: false</tt> are not affected, since the client pays for gas out of its own wallet.</p>"}], "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": "<p>Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to drain the fee-payer wallet, resulting in denial of service for legitimate clients.</p><p>When the <tt>mpp</tt> Elixir library is configured as fee payer (<tt>fee_payer: true</tt>), the <tt>MPP.Methods.Tempo</tt> payment method co-signs and broadcasts a client-supplied EVM transaction without first validating that the client-supplied <tt>gas_limit</tt> is sufficient to complete the intended call. A malicious client can submit a signed <tt>transferWithMemo</tt> transaction with <tt>gas_limit</tt> deliberately set just below the amount required for successful execution. The server co-signs the transaction and broadcasts it via <tt>rpc_broadcast_sync</tt>. The transaction runs out of gas during EVM execution and reverts, but the fee-payer wallet is still charged for the burned gas while the client pays nothing and receives no resource. Repeated requests from one or more malicious clients drain the fee-payer wallet at near-zero cost to the attacker, ultimately preventing the server from sponsoring gas for legitimate payment requests.</p><p>The <tt>wait_for_confirmation = false</tt> (optimistic) path is also affected: it invokes <tt>simulate_payment_call</tt> via <tt>eth_call</tt>, but that simulation omits the <tt>gas</tt> parameter and therefore does not catch out-of-gas conditions.</p><p>This issue affects mpp: from 0.2.0 before 0.6.0.</p>"}], "value": "Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to drain the fee-payer wallet, resulting in denial of service for legitimate clients.\n\nWhen the mpp Elixir library is configured as fee payer (fee_payer: true), the MPP.Methods.Tempo payment method co-signs and broadcasts a client-supplied EVM transaction without first validating that the client-supplied gas_limit is sufficient to complete the intended call. A malicious client can submit a signed transferWithMemo transaction with gas_limit deliberately set just below the amount required for successful execution. The server co-signs the transaction and broadcasts it via rpc_broadcast_sync. The transaction runs out of gas during EVM execution and reverts, but the fee-payer wallet is still charged for the burned gas while the client pays nothing and receives no resource. Repeated requests from one or more malicious clients drain the fee-payer wallet at near-zero cost to the attacker, ultimately preventing the server from sponsoring gas for legitimate payment requests.\n\nThe wait_for_confirmation = false (optimistic) path is also affected: it invokes simulate_payment_call via eth_call, but that simulation omits the gas parameter and therefore does not catch out-of-gas conditions.\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": 8.2, "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:N/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE"}, "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": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-17T10:11:54.436Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-vj8p-hp9x-gh47"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-59252.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-59252"}, {"tags": ["patch"], "url": "https://github.com/ZenHive/mpp/commit/d84e3e528db39654540c2035ea0fbdf7b950d3d1"}], "source": {"discovery": "EXTERNAL"}, "title": "Missing gas_limit validation in mpp Tempo fee-payer enables wallet drain", "x_generator": {"engine": "cvelib 1.8.0"}}}}

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