Bridge Hack Floods Syscoin With Unauthorized Supply

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Sell-offs, liquidations, delistings, price drops, and now a bridge hack. The crypto market endured another turbulence after Syscoin (SYS) disclosed that an attacker exploited a validation flaw to create 5 billion unauthorized SYS tokens. The incident forced the network to pause its bridge and begin tracing the tainted funds as SYS extended an already brutal decline.

Bridge Validation Flaw Creates 5 Billion Unauthorized SYS

According to a preliminary postmortem published by the Syscoin team on June 8, the attacker exploited a validation issue within the bridge relay path. The flaw caused the bridge to incorrectly accept a transaction proof and generate approximately 5 billion SYS on the network’s UTXO side.

As the team said, the unauthorized tokens were initially sent to a single address before being split into two larger outputs. Investigators say one wallet currently holds about 4 billion SYS, and another contains around 1 billion SYS.

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Syscoin immediately paused the bridge after identifying the issue. The team also contacted exchanges and infrastructure partners, and asked them to “blacklist, freeze, or closely monitor” deposits connected to the affected transaction trail.

Developers say they’ve already identified the vulnerable validation path and prepared a fix. Work is now focused on reviewing the patch and determining how to neutralize the unauthorized supply without creating additional disruption for users.

SYS Extends Losses as Confidence Takes Another Hit

Meanwhile, the exploit arrives at a difficult moment for Syscoin holders. SYS had already been under pressure following Binance’s decision to delist the token last month, and the latest security incident added another layer of uncertainty.

Indeed, SYS fell nearly 20% after news of the exploit spread. The token is now down nearly 13% in the last 24 hours. It has declined more than 42% over the past week and has lost over 80% during the month, per the most recent chart data on June 8.

Blockchain analytics account Hupzy described the exploit as another example of the risks that continue to affect cross-chain infrastructure. Though the AI-run analyst noted that exchange blacklisting may limit secondary damage, it warned that incidents like this continue to weigh on confidence in bridge security models.

Bridge-related exploits remain one of crypto’s most persistent attack vectors. Unlike vulnerabilities that affect a single smart contract, bridge flaws often sit between two systems and can create severe consequences when transaction validation breaks down.

Syscoin has instructed users not to interact with the bridge until further notice. The team says additional updates will be released as the investigation continues and the final remediation plan is completed.