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Secure Exchange Operations and User Assets
“We are big fans of BlockSec and have been deeply involved from the inception of BlockSec to the use of each of its products. Phalcon is a very good security tool, to help Bybit achieve on-chain tracking and web3 contract security monitoring. We will have more cooperation with BlockSec in the future.”
~$11.3M Lost: Multicall Router, Nostra | BlockSec Weekly
This report, covering 2026/09/14 - 2026/09/20, examines two security incidents with approximately $11.3M in combined losses, on Ethereum and Starknet. In the larger one, a multicall router accepted its own address as a dispatch target, so the nested call reached the Gateway module of a Safe wallet carrying the router's own already-authorized identity instead of the external caller's, and roughly 2,900 `aEthrsETH` was routed out of that wallet into an attacker-created Uniswap v4 pool. On Starknet, Nostra's oracle integration required a minimum of only one aggregated source, so when only two of the three configured price sources reached the aggregation, a manipulated thin-pool quote averaged with a normal quote to value `NSTR` at roughly $49.52, supporting approximately $3.5M of borrowing against overvalued collateral.
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