Berachain Reth & Geth
September 2025
Sigma Prime reviewed the Berachain execution-client stack, including bera-reth and bera-geth, for consensus-critical behavior before production stress conditions. The work focused on cross-client compatibility, transaction decoding, validation discipline, and places where a client divergence could become a network-level fault.
Executive summary
Sigma Prime assessed Berachain’s execution-client stack (bera-reth and bera-geth) with emphasis on consensus-critical correctness and cross-client behavioral consistency. The review identified multiple high-impact client divergence and validation issues, alongside medium and low-severity hardening findings. The outcome provides a prioritized remediation roadmap for reducing consensus mismatch risk before production stress conditions.
By the numbers
Total findings
20
High + critical findings
4
What we reviewed
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Client consensus compatibility
Cross-client behavior between bera-reth and bera-geth for protocol-critical paths.
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Transaction handling
PoL transaction validation and decoding, including edge-case handling and malformed inputs.
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Protocol rule conformance
Implementation-level checks against expected Berachain execution semantics.
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