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Crypto · October 23, 2026

Ethereum’s long-awaited Glamsterdam upgrade hits another roadblock as 13 security risks emerge

3 sources →

Ethereum developers have postponed the Glamsterdam upgrade on the Hoodi test network, originally scheduled for late October 2026. This decision follows a security review by ChainSecurity, which identified potential risks in how proposed gas-accounting changes—specifically EIP-8037 and EIP-8038—could disrupt existing smart contracts. Researchers found 13 real-world examples where these changes could cause transactions to fail or allow errors to become permanent. While the upgrade was previously targeted for a December 2026 mainnet rollout, no new timeline has been established following this setback.

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Hype check

How the hype check works

Confirmed · 2

Backed by filings, on-chain data, official statements or several independent publishers.

  • The Glamsterdam Hoodi testnet upgrade is postponed (Ethereum Foundation)
  • Thirteen contracts were found to be at risk from gas changes (ChainSecurity)

Claimed · 1

Said by a company, project or person; not yet independently confirmed.

  • Proposed gas rules could let smart contracts permanently record failed operations (Security researchers)

Speculation · 1

Price talk, forecasts or unnamed sources, quoted as someone else's view.

  • The delay might prevent a December 2026 mainnet rollout (CryptoSlate)

Reported by multiple outlets

  • The Glamsterdam upgrade on the Hoodi testnet has been postponed.
  • ChainSecurity identified 13 real-world examples of smart contracts at risk from the upgrade.
  • The core issue involves proposed changes to Ethereum's gas-accounting system.
  • Developers were advised to revert to older software versions or install updated clients that remove the activation trigger.
  • The mainnet rollout was previously targeted for December 2026 but remains unconfirmed.

Reported by only some outlets

  • The Hoodi testnet activation was specifically scheduled for October 26 (reported by CryptoSlate) or 'Monday' (reported by CoinDesk).
  • Christine Kim of Protocol Watch was the first to disclose the cancellation (reported by CryptoSlate).
  • The specific technical protocols involved are EIP-8037 and EIP-8038 (reported by CoinDesk).
  • The Hoodi testnet planned to implement a 200 million gas limit (reported by CoinDesk).

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