Nimiq hacked
An attacker exploited an OpenGSN meta-transaction authorization flaw on Polygon HTLC contracts, allowing them to lock and redeem stablecoins worth approximately $50,463. The attacker used leftover ERC-20 allowances to move USDC, USDT0, and USDC.e into HTLCs and then redeemed them.
- Estimated loss
- $50,463
- Protocols
- Nimiq
- Chains
- Polygon
- Confidence
- High
- First seen
- 18 Sep 2026, 10:00 UTC