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Oct 23, 2026

Ethereum delays Glamsterdam upgrade after security researchers flag gas-related risks

Ethereum developers postponed the Glamsterdam hard fork on the Hoodi testnet after security firm ChainSecurity identified gas-related vulnerabilities affecting existing smart contracts. The researchers flagged 13 deployed mainnet contracts where proposed gas accounting changes could convert temporary transaction failures into permanent losses.

Oct 23, 2026·9 sources
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Top claims

  • ▪The postponement of the Glamsterdam upgrade was agreed upon during the October 22, 2026, All Core Developers Execution meeting #248.
  • ▪The Ethereum Foundation has not announced a replacement activation date for Hoodi or confirmed a mainnet deployment schedule for Glamsterdam.
  • ▪ChainSecurity disclosed on October 22, 2026, that it had identified 13 real-world deployed mainnet contracts vulnerable to gas-accounting changes under Glamsterdam.

Topics

EthereumSmart contract vulnerabilitiesEthereum Glamsterdam Sepolia forkCrypto securityEthereum securityEthereum upgradesCryptocurrenciesSmart contracts