By Isaac • November 6, 2026 7:12 pm •
A software flaw in one of Ethereum’s fastest-growing execution clients has forced a coordinated patch across several major blockchain networks—but developers say the bug did not lead to stolen funds.
The issue was found in Reth, an Ethereum execution client built by Paradigm. Under a narrow set of smart-contract storage conditions, Reth’s legacy state-root code could calculate the wrong result, according to reporting by CryptoSlate.
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A state root is essentially a cryptographic fingerprint of a blockchain’s current condition, including balances and contract data. If different nodes calculate different roots, they can disagree over whether a block is valid.
That can stall infrastructure or produce unreliable state proofs even when no attacker has stolen anything.
The vulnerable
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