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According to analysis by BlockSec Phalcon (@Phalcon_xyz), Aztec Network's RollupProcessorV3 contract was attacked, resulting in losses exceeding $2.15 million. The root cause is that `numRealTxs` was not effectively bound to the transaction set enforced by the ZK proof, causing a deviation between the proof verification path and the L1 settlement logic's interpretation of the transaction list.The attacker exploited this vulnerability to move real deposits to slots not processed by the settlement logic, bypassing the `decreasePendingDepositBalance()` function. By creating unbacked private balances out of thin air, they were able to withdraw funds through the normal settlement process. A total of seven assets were involved.
According to BlockSec Phalcon, the HandlerV1 contract managed by Hyperbridge on the Ethereum network was found to contain a Merkle Mountain Range (MMR) proof replay vulnerability, resulting in approximately $242,000 in losses. The vulnerability stems from the lack of binding between proofs and requests, enabling attackers to replay historical valid proofs alongside newly forged requests to perform malicious actions—such as altering administrator privileges. In the specific incident, the attacker changed the Polkadot (DOT) token administrator and then exploited those privileges to mint additional DOT tokens for profit. Observed attack transactions include: changing the DOT token administrator and minting new tokens (losses of ~$237,400), changing the ARGN token administrator and minting new tokens (losses of ~$3,800), and host withdrawal operations. The vulnerability was discovered by PhalconSecurity and analyzed via PhalconExplorer. Previously, the Hyperbridge gateway contract was attacked, leading to the unauthorized minting and subsequent dumping of 1 billion DOT tokens on Ethereum.