CVE-2026-73829

Time-of-check Time-of-use TOCTOU Race Condition in ZenHive mpp allows an unauthenticated remote client to redeem one confirmed on-chain payment for multiple paid-resource accesses. The type="hash" credential path in MPP.Methods.Tempo.verify/2 guards against replay with a non-atomic check-then-mar...

CVE-2026-73829

ZenHive mpp (Elixir MPP library) versions 0.2.0 through 0.6.0 contain a TOCTOU race condition in the type="hash" credential path of MPP.Methods.Tempo.verify/2. The dedup check-then-mark sequence is non-atomic: check_hash_unused/2 reads the store, an on-chain receipt is verified, and only then doe...

CVE-2026-73829 Non-atomic hash-credential dedup in mpp Tempo allows replay of a confirmed payment under a concurrent race

Time-of-check Time-of-use TOCTOU Race Condition in ZenHive mpp allows an unauthenticated remote client to redeem one confirmed on-chain payment for multiple paid-resource accesses. The type="hash" credential path in MPP.Methods.Tempo.verify/2 guards against replay with a non-atomic check-then-mar...