Paradigm CTO Georgios Konstantopoulos reported a program flaw in Reth, the firm’s Ethereum execution client, that caused nodes to stall. Paradigm’s GitHub disclosure attributes the trigger to block height 2327426 and identifies affected Ethereum mainnet releases v1.6.0 and v1.4.8.
Reth, implemented in Rust, executes transactions and computes the state root used to validate the blockchain’s global state; an incorrect computation can prevent nodes from validating incoming blocks and impede synchronization. The advisory specifies this is an execution-layer processing issue rather than a consensus protocol failure.
Konstantopoulos has published mitigation instructions to assist operators recovering Reth nodes while Paradigm continues a technical investigation into the root cause. Per Ethernodes data, Reth accounts for approximately 5.4% of execution-client market share, indicating a limited network impact.