Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-59252.html
- https://github.com/ZenHive/mpp/commit/d84e3e528db39654540c2035ea0fbdf7b950d3d1
- https://github.com/ZenHive/mpp/security/advisories/GHSA-vj8p-hp9x-gh47
- https://osv.dev/vulnerability/EEF-CVE-2026-59252
- https://github.com/ZenHive/mpp/security/advisories/GHSA-vj8p-hp9x-gh47
FAQ
What is CVE-2026-59252?
CVE-2026-59252 is a documented vulnerability. 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 th...
How severe is CVE-2026-59252?
CVSS scoring is not yet available for CVE-2026-59252. Check NVD for updates.
Is there a patch for CVE-2026-59252?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.