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Ethereum Core Developers Delay Glamsterdam Hoodi Fork Over Eight Smart Contract Risks
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Ethereum core developers delayed Glamsterdam Hoodi fork pending resolution of eight smart contract risks. Risks relate to EIP-8037 and EIP-8038 changing gas for create operations and state access.
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Hoodi Fork Paused
Ethereum core developers delayed the Glamsterdam upgrade’s implementation on the Hoodi testnet until security concerns tied to eight smart contract invariants are resolved.
The Ethereum Foundation said the decision followed an Oct. 13 report from smart contract auditor ChainSecurity, which found that EIP-8037 and EIP-8038 could break smart contracts that rely on fixed gas-related assumptions when external calls fail.
Ethereum devs said some existing Ethereum projects rely on assumptions that certain operations would cost a specific amount of gas, and those assumptions would be invalidated by Glamsterdam’s EIP-8037 and EIP-8038 because they change how gas is charged for certain operations.
The Ethereum Foundation added that the Hoodi fork will not proceed until the issues are resolved, while Glamsterdam remains active on the Sepolia testnet after going live on Oct. 6.
The DiarioBitcoin account described the Hoodi activation as scheduled for October 26, while developers and auditors review eight proposed smart contract assumptions that could be affected by changes to gas accounting.
Invariants, Audits, and Calls
ChainSecurity’s Oct. 13 analysis focused on how gas behaves when external calls fail, and the Ethereum Foundation said the two EIPs could break smart contracts that rely on fixed gas-related assumptions.
DiarioBitcoin said the pause would allow assessing whether existing applications can adapt, and it described EIP-8037 and EIP-8038 as modifying how much gas certain state creation and access operations charge.
The Ethereum Foundation asked for a review of on-chain code and external infrastructure, and it assembled eight invariants affected in a public repository with explanations, examples and review instructions.
Alex Stokes, an Ethereum core developer, said, "Core developers decided to delay the upcoming Hoodi hard fork on today’s ACDE call."
The Shattered account quoted the Foundation’s notice reason as "further investigation of interactions of EIP-8037 with mainnet smart contracts."
What Comes Next
The Shattered account said the Ethereum Foundation framed the Hoodi delay as a configuration rollback, not a chain reversal, and it said Hoodi’s history stays intact. Shattered also said the notice removed the Amsterdam execution-layer activation, the Gloas consensus-layer activation, and the gas-limit schedule that would have raised Hoodi’s gas limit to 200 million at the same epoch. The Ethereum Foundation said the Hoodi fork will not proceed until the issues are resolved, and it said delaying the Hoodi testnet fork gives developers more time to identify potential smart contract issues and determine whether changes are needed before Glamsterdam progresses toward mainnet deployment.
DiarioBitcoin said no new date for the testnet had been announced as of November 6, and it said Glamsterdam remains under test in other aspects while work on the subsequent Hegota upgrade continues in parallel. Cointelegraph said the upgrade aims to advance Ethereum’s layer-1 scaling roadmap with enshrined proposer-builder separation, block-level access lists and changes to gas pricing that better reflect the cost of execution.