275 lines
13 KiB
JSON
275 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-59694",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-07-06T14:05:47.003Z",
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"datePublished": "2026-07-17T10:11:49.192Z",
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"dateUpdated": "2026-07-18T04:12:36.335Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MPP.Tempo.Transaction'"
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],
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"packageName": "mpp",
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"packageURL": "pkg:hex/mpp",
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"product": "mpp",
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"programFiles": [
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"lib/mpp/tempo/transaction.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.MPP.Tempo.Transaction':cosign_fee_payer/3"
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}
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],
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"repo": "https://github.com/ZenHive/mpp",
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"vendor": "ZenHive",
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"versions": [
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{
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"lessThan": "0.6.0",
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"status": "affected",
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"version": "0.2.0",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.MPP.Tempo.Transaction'"
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],
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"packageName": "ZenHive/mpp",
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"packageURL": "pkg:github/ZenHive/mpp",
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"product": "mpp",
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"programFiles": [
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"lib/mpp/tempo/transaction.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.MPP.Tempo.Transaction':cosign_fee_payer/3"
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}
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],
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"repo": "https://github.com/ZenHive/mpp",
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"vendor": "ZenHive",
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"versions": [
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{
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"lessThan": "5d6338e2334084c5f2a78cfcca474830733ed7e8",
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"status": "affected",
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"version": "d29d54e507918db00a5b65d90136b73166c017d7",
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"versionType": "git"
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}
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]
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}
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],
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"configurations": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"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>"
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}
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],
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"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."
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "0.6.0",
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"versionStartIncluding": "0.2.0",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "AND"
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}
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],
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"operator": "OR"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Kian Kai Ang"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "E.FU"
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},
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{
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"lang": "en",
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"type": "analyst",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>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.</p><p>When the <tt>mpp</tt> Elixir library is configured as fee payer (<tt>fee_payer: true</tt>), <tt>MPP.Tempo.Transaction.cosign_fee_payer/3</tt> re-signs the client-supplied base fields of the <tt>0x76</tt> 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 <tt>transferWithMemo</tt> 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.</p><p>At the maintainer's default of 137 access-list entries (fitting within Bandit's 10,000-byte per-header-field limit) and 100 Gwei <tt>max_fee_per_gas</tt>, 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.</p><p>This issue affects mpp: from 0.2.0 before 0.6.0.</p>"
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}
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],
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"value": "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.\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'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.\n\nThis issue affects mpp: from 0.2.0 before 0.6.0."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-130",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-130 Excessive Allocation"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 8.3,
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"baseSeverity": "HIGH",
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"privilegesRequired": "NONE",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"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",
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"version": "4.0",
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"vulnAvailabilityImpact": "LOW",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "HIGH"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-1284",
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"description": "CWE-1284 Improper Validation of Specified Quantity in Input",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-07-18T04:12:36.335Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-qpxh-ff8m-c62v"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-59694.html"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-59694"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/ZenHive/mpp/commit/5d6338e2334084c5f2a78cfcca474830733ed7e8"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "Unbounded access list in mpp Tempo fee-payer inflates gas cost per payment",
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/ZenHive/mpp/security/advisories/GHSA-qpxh-ff8m-c62v",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-07-17T12:22:40.105353Z",
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"id": "CVE-2026-59694",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-07-17T12:22:45.224Z"
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}
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}
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]
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}
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} |