Polygon's Proof-of-Stake (PoS) blockchain experienced a significant delay in transaction finality on September 10, 2025, with transactions taking 10-15 minutes longer than usual to become irreversible. While block production continued uninterrupted, the finality issue caused disruptions for decentralized finance (DeFi) applications and validators who require higher assurance before settling trades and crediting deposits.
The issue was traced to a bug affecting Polygon's Bor and Erigon nodes, critical components responsible for block production and data storage. This led to disruptions in Remote Procedure Call (RPC) services, causing access problems for some applications built on the network. Validators were required to revert to the last finalized block and resynchronize their nodes.
Polygon Foundation confirmed that a fix has been identified and is being rolled out to validators and service providers. The team assured users that restarting affected nodes has resolved the issue for many participants, and engineers are working closely with infrastructure providers to accelerate debugging and restore full functionality. The network's core chain operations remain unaffected, with blocks continuing to be produced normally.
The timing is notable as it comes weeks after Polygon's Heimdall v2 upgrade, which promised 5-second finality through a modernized consensus stack. During the incident, Polygon's POL token traded approximately 3% lower, slipping to around 26 cents in early U.S. trading hours.