CVE-2026-73541

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.

• CWE-770

• https://cna.erlef.org/cves/CVE-2026-73541.html
• https://github.com/ZenHive/mpp/commit/ddc46868fba57ccebb567c04709812b466123076
• https://github.com/ZenHive/mpp/security/advisories/GHSA-j4j7-7xpr-c7cr
• https://osv.dev/vulnerability/EEF-CVE-2026-73541

Published

Aug 19, 2026

Last Modified

Aug 20, 2026

Status

Awaiting Analysis

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