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BlockSec Identifies Aztec Vulnerability: numRealTxs Mismatch Allowed Creation of Unsecured Balances

Security Incidents

2026-06-15 05:21:44

AZTEC5.75%

According to BlockSec Phalcon, the Aztec vulnerability stemmed from numRealTxs in RollupProcessorV3 failing to bind with the transaction set enforced by zero-knowledge proofs. The vulnerability verification path decoded all transactions from encodedInnerTxData and inserted them into the rollup Merkle tree, while L1 settlement logic only processed the first numRealTxs decoded slots. Attackers exploited this mismatch by placing legitimate deposit transactions in later slots while setting numRealTxs to a lower value, bypassing checks like decreasePendingDepositBalance() and creating unsecured asset balances that were then withdrawn through normal redemption processes. The attack created unsecured balances across multiple assets simultaneously.

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