The Ethereum Foundation said on October 22, in a blog post, that core developers had pushed back the Glamsterdam network upgrade on the Hoodi testnet, originally due to go live on October 26. The decision followed a routine protocol coordination call known as ACDE #248.
The delay follows a warning from the security firm ChainSecurity, which found that two proposals in the upgrade, EIP-8037 and EIP-8038, change how gas is accounted for in a way that could undo protections against so-called insufficient gas griefing, an attack in which someone deliberately sends too little gas so an operation fails. Under the new rules, an operation that previously would have reverted could instead receive enough leftover gas to complete. In one example cited by ChainSecurity, creating a new storage slot after a separate gas allowance runs out would cost 110,020 gas instead of the previous 22,100.
ChainSecurity first flagged the issue on October 13 and said that by October 22 it had identified 13 real-world smart contracts that could be affected, though it did not name the projects, saying it is coordinating disclosure with them directly.
The Ethereum Foundation said the pause gives developers time to study how EIP-8037 interacts with contracts already deployed on the Ethereum mainnet. The postponement also pushes back a planned increase of Hoodi's gas limit to 200 million and the activation of Gloas on the consensus layer; node and validator operators running Hoodi were told to update their configurations, since the old activation schedule no longer applies.
No new date has been set for Hoodi, and the mainnet rollout of Glamsterdam, previously discussed for early December, remains unconfirmed. Glamsterdam had already activated successfully on a separate testnet, Sepolia, on October 6.
