Notably, the event only affected the global platform, with the separately run Polymarket US left untouched. Even more, the attacker was unable to withdraw a final batch of $750,000, which Polymarket promptly froze upon getting wind of the hack.
Damage control
For about an hour, Polymarket placed international exchange into “cancel-only” mode while it conducted investigations. Soon after, the issue was resolved, and operations resumed as usual.
Polymarket has now said all victims will be “made whole” through full reimbursements. The company has also referred the incident to UK law enforcement, since DebugBear is headquartered in the UK.
Notably, this is the second major security breach event at Polymarket. The first took place in June, with malicious code targeting 15 high-net-worth individuals and netting $3 million in losses.
Ledger escalating theft
Meanwhile, police in Singapore have reported that the Ledger supply chain in the country has also been compromised as part of the recent wave of similar incidents across Asia. Losses have so far amounted to $2.7 million, with further investigations taking place.
Ledger’s supply chain in Singapore is compromised too, according to SG police.
I have many crypto friends in SG. Please be extra careful. Stay SAFU! 🙏https://t.co/Rfs4uEJ0n2 https://t.co/AVpSN3sayr
— CZ 🔶 BNB (@cz_binance) October 29, 2026

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