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Sep 18, 2026

Ethereum confirms October 6 Glamsterdam testnet launch amid security warnings

Ethereum developers confirmed the Glamsterdam upgrade will activate on the Sepolia testnet on October 6, but warned that cheap test ether could allow malicious builders to exploit block auctions and potentially stall the chain during testing.

Sep 18, 2026·3 sources

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Top claims

▪The Glamsterdam upgrade's ePBS builder abuse vulnerability does not threaten real mainnet Ethereum funds, but it can disrupt infrastructure testing on public testnets such as Sepolia
▪Ethereum's public roadmap targets the fourth quarter of 2026 for the Glamsterdam upgrade's mainnet activation, though no official mainnet date has been scheduled
▪Ethereum's Hoodi testnet public Glamsterdam test is tentatively planned for October 27, 2026, depending on the performance of Ethereum's Sepolia testnet Glamsterdam test on October 6, 2026

Topics

Ethereum MEV & block building Ethereum security Ethereum upgrades