Syscoin Pauses Bridge After Attacker Mints 5 Billion Unauthorized SYS

Syscoin (SYS) paused its bridge after an attacker exploited a validation subject, creating roughly 5 billion unauthorized SYS on the community’s UTXO chain.

The venture is tracing the unauthorized tokens and dealing with exchanges to maintain the contaminated balances out of open markets.

How the Attacker Minted 5 Billion SYS

The incident centered on the bridge relay path, which checks transactions transferring between two chains. The crew stated that the trail wrongly accepted a transaction proof.

The system then handled the fraudulent transaction as legitimate. It minted an unauthorized output of about 5 billion SYS by way of the UTXO bridge path.

“An attacker exploited a validation subject within the bridge stream that resulted in an unauthorized SYS output being created on the UTXO aspect,” the post learn.

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Those funds first reached a single deal with. Attackers later spent and split them into two tainted balances of roughly 4 billion and 1 billion SYS throughout separate wallets.

Syscoin described the findings as preliminary. It additionally urged users not to interact with the bridge whereas it stays paused.

“The crew has recognized the affected validation path and has a repair in place. Our precedence now could be to finish implementation and evaluation of the repair, whereas additionally figuring out the right course of to rectify the unauthorized SYS output and neutralize its influence on the community. We will present additional updates as soon as the remediation path has been finalized,” Syscoin stated.

The information negatively impacted the token’s value. According to BeInCrypto Markets knowledge, SYS fell greater than 7% over 24 hours, buying and selling close to $0.0016. The droop comes amid a broader market restoration, which has lifted complete market capitalization by over 2%.

The breach provides to a tense stretch for blockchain safety. PeckShield logged 40 main incidents in May 2026, with 8 bridge and cross-chain exploits.

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