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BlockSec: Wanchain’s Cardano cross-chain bridge was attacked, and about 515 million NIGHT tokens in the bridge vault were stolen

2026-07-21 07:27:24

Abstract generation in progress

PANews July 21, citing BlockSec monitoring, the Cardano cross-chain bridge of Wanchain was attacked, with about 515 million NIGHT tokens stolen from the bridge treasury vault. Preliminary investigation indicates the root cause was a non-injective signature message encoding issue in the TreasuryCheck validator. The signature message was constructed by concatenating 14 variable-length redemption fields (folded using AppendByteString) with no separators or length prefixes, allowing different combinations of field values to produce the same byte string, thereby reusing the same hash and a valid signature. BlockSec confirmed the vulnerability by decompiling on-chain Plutus V2 bytecode and decoding the redemption data in the attack transaction. Using Sha3_256(SerialiseData(...)) in place of the current approach, which provides clear CBOR encoding field boundaries, would prevent this type of split-signature hash reuse attack.

ADA2.48%

NIGHT3.18%

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