Polygon Releases Bor v2.10.3 to Fix Parallel Execution Vulnerabilities

The timing matters: BlockSTM V2 is a relatively new parallel execution engine, and this is its first notable security patch, so the disclosure tests how quickly validators and node operators upgrade. The attack surface is narrow — a shared cache and repeated code-hash computation — but DoS vectors in parallel execution can degrade block production for everyone on the chain, not just the affected node. The open question is upgrade uptake across the validator set, since any node still on v2.10.1 or v2.10.2 remains exposed.