Polygon PoS Incident Post-Mortem

On December 17-18, 2025, Polygon PoS suffered a partial service disruption in Bor, its block-producing and transaction execution client, which mainly degraded RPC availability across several infrastructure providers. The chain itself stayed online: block production continued, validators remained active, and transactions were still processed, with no halts or reorgs. Multiple Bor nodes stalled at the execution layer, causing RPC request failures, temporary validator desynchronization, and lagging block explorers. Polygon engineers set up a war room and deployed a targeted patch to affected operators, after which nodes resynchronized and validators returned to quorum.