How Hackers Used Gravity Bridge's Own Validators to Steal $5.4M




 A cross-chain bridge lost $5.4 million last week. Not because the code was broken. Because the people running it were turned against themselves without knowing it.

Gravity Bridge, which connects Ethereum and the Cosmos ecosystem, was drained on May 30 after an attacker manipulated its validator set in a two-stage operation that took just over 28 hours from start to finish.

Here is the basic structure of what happened.

Gravity Bridge uses a system where funds on its Ethereum contract only release when validators holding 2/3 of the voting power sign off. No admin key. No override. Signatures are everything.

A dormant wallet that had been a legitimate bridge relayer in early 2025 woke up after roughly 280 days and submitted a validator set update. It shrank the active set from 58 validators to 34. Enough of the original validators, by voting power, signed that change themselves, clearing the required threshold.

Twenty-eight hours later, the concentrated set signed the withdrawals and four transactions drained $4.3M in USDC, 274 ETH, $434K in USDT, and around $64K in PAYG tokens into a single wallet.

Blockchain security firm PeckShieldAlert flagged the drain in real time on X. Independent security researcher BlackHartInc published a full forensic thread walking through each transaction with on-chain links.

The leading theory is that the validators' automated signing software was compromised. Dozens of independent validators do not get tricked one by one. Something in their shared pipeline signed the malicious update without flagging it.

The stolen funds were converted to ETH. More than $4.2M in ETH remained in the attacker's wallet at the time of reporting, with some funds already moved through ChangeNow and Binance.

What this shows is that code audits alone are not enough. A technically correct contract still got emptied because the signing layer above it was poisoned.

For a full forensic breakdown of exactly how the attack unfolded, transaction by transaction, read the full investigation at CryptoNewsLive.org.

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