ZenHive mpp up to 0.11.x FeePayerPolicy reserve_hash_atomic allocation of resources

Summaryinfo

A vulnerability classified as critical has been found in ZenHive mpp up to 0.11.x. The affected element is the function reserve_hash_atomic of the component FeePayerPolicy. The manipulation leads to allocation of resources. This vulnerability is referenced as CVE-2026-73541. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in ZenHive mpp up to 0.11.x. It has been rated as critical. This issue affects the function reserve_hash_atomic of the component FeePayerPolicy. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is integrity, and availability. The summary by CVE is:

Allocation of Resources Without Limits or Throttling in ZenHive mpp allows an unauthenticated remote client to drain the fee-payer wallet through concurrent sponsored payments, denying service to legitimate payers once it is empty. MPP.Methods.Tempo.FeePayerPolicy enforces its ceilings (max_gas, max_fee_per_gas, max_priority_fee_per_gas, the worst-case gas_limit * max_fee_per_gas <= max_total_fee budget cap, and a validity window) against one transaction at a time, and nothing accounts for exposure across concurrent requests. reserve_hash_atomic/2 is keyed on the transaction hash, so it prevents duplicate broadcast of the same signed transaction but not N distinct sponsored transactions carrying distinct expiring nonces. Committed sponsor exposure is therefore N times max_total_fee, bounded by nothing in the library, and the default 900 second validity window lets co-signed transactions stay broadcastable and uncounted for that entire period. This issue affects mpp: from 0.2.0 before 0.12.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-73541 since 08/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 0.12.0 eliminates this vulnerability.

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Productinfo

Vendor

• ZenHive

Name

• mpp

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11

Website

• Product: https://github.com/ZenHive/mpp/

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