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6 vulnerabilities by ZenHive
CVE-2026-59695 (GCVE-0-2026-59695)
Vulnerability from nvd – Published: 2026-07-17 10:11 – Updated: 2026-07-17 12:53
VLAI
EPSS
VEX
Title
Unbounded max_fee_per_gas in mpp Tempo fee-payer enables single-request wallet drain
Summary
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.
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 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.
This issue affects mpp: from 0.2.0 before 0.6.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ZenHive/mpp/security/advisorie… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-59695.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-59695 | related |
| https://github.com/ZenHive/mpp/commit/5d6338e2334… | patch |
Impacted products
Credits
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CVE-2026-59694 (GCVE-0-2026-59694)
Vulnerability from nvd – Published: 2026-07-17 10:11 – Updated: 2026-07-17 12:22
VLAI
EPSS
VEX
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
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
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
Credits
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CVE-2026-59252 (GCVE-0-2026-59252)
Vulnerability from nvd – Published: 2026-07-17 10:11 – Updated: 2026-07-17 12:21
VLAI
EPSS
VEX
Title
Missing gas_limit validation in mpp Tempo fee-payer enables wallet drain
Summary
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.
When 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.
The 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.
This issue affects mpp: from 0.2.0 before 0.6.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ZenHive/mpp/security/advisorie… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-59252.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-59252 | related |
| https://github.com/ZenHive/mpp/commit/d84e3e528db… | patch |
Impacted products
Credits
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CVE-2026-59252 (GCVE-0-2026-59252)
Vulnerability from cvelistv5 – Published: 2026-07-17 10:11 – Updated: 2026-07-17 12:21
VLAI
EPSS
VEX
Title
Missing gas_limit validation in mpp Tempo fee-payer enables wallet drain
Summary
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.
When 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.
The 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.
This issue affects mpp: from 0.2.0 before 0.6.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ZenHive/mpp/security/advisorie… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-59252.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-59252 | related |
| https://github.com/ZenHive/mpp/commit/d84e3e528db… | patch |
Impacted products
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CVE-2026-59694 (GCVE-0-2026-59694)
Vulnerability from cvelistv5 – Published: 2026-07-17 10:11 – Updated: 2026-07-17 12:22
VLAI
EPSS
VEX
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
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
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
Credits
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CVE-2026-59695 (GCVE-0-2026-59695)
Vulnerability from cvelistv5 – Published: 2026-07-17 10:11 – Updated: 2026-07-17 12:53
VLAI
EPSS
VEX
Title
Unbounded max_fee_per_gas in mpp Tempo fee-payer enables single-request wallet drain
Summary
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.
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 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.
This issue affects mpp: from 0.2.0 before 0.6.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ZenHive/mpp/security/advisorie… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-59695.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-59695 | related |
| https://github.com/ZenHive/mpp/commit/5d6338e2334… | patch |
Impacted products
Credits
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"cveId": "CVE-2026-59695",
"datePublished": "2026-07-17T10:11:43.674Z",
"dateReserved": "2026-07-06T14:05:47.003Z",
"dateUpdated": "2026-07-17T12:53:17.645Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}