Syscoin Pauses Bridge After Exploit Creates 5B Unauthorized SYS

Published by

Nidhi Kolhapur

June 8, 2026

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Syscoin has paused its Bridge after a security incident that resulted in the creation of approximately 5 billion unauthorized SYS tokens. In a preliminary postmortem, the team said an attacker exploited a validation flaw in the Bridge process, causing the system to incorrectly accept a transaction proof and generate the unauthorized outputs through the UTXO Bridge path. The funds were later moved and split across multiple addresses, with around 4 billion SYS and 1 billion SYS traced to two major tainted wallets. Syscoin said it has identified the issue, prepared a fix, and is working with exchanges and ecosystem partners to monitor, freeze, or blacklist affected funds. Users have been advised not to use the Bridge until further notice.

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