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Crypto · October 23, 2026

Ethereum Delays Glamsterdam Testnet Fork Over Gas Security Flaws

4 sources →

Ethereum developers have postponed the Glamsterdam upgrade on the Hoodi test network, originally scheduled for October 26, 2026. This decision follows a report from security auditor ChainSecurity, which identified vulnerabilities related to gas-accounting changes proposed in EIP-8037 and EIP-8038. ChainSecurity found 13 real-world examples where these changes could cause smart contracts to permanently record failed operations or disrupt DeFi protocols. The Ethereum Foundation is currently assessing the extent of the exposure, and no new date for the testnet activation has been set.

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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 Hoodi testnet upgrade is postponed from its October 26 date. (Ethereum Foundation)
  • ChainSecurity found 13 real-world examples of contracts at risk. (ChainSecurity)

Claimed · 1

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

  • Proposed gas changes could let contracts permanently record failed operations. (ChainSecurity)

Speculation · 1

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

  • The setback could prevent the upgrade from launching by the end of 2026. (CryptoSlate)

Reported by multiple outlets

  • The Glamsterdam upgrade on the Hoodi testnet has been postponed.
  • The cancellation occurred after security firm ChainSecurity flagged risks associated with gas-accounting changes.
  • ChainSecurity identified 13 real-world examples of contracts that could be affected by the security flaw.
  • The upgrade was originally scheduled to go live on the Hoodi testnet on Monday, October 26, 2026.
  • The flaw involves how smart contracts handle failed transactions, potentially making errors permanent.

Reported by only some outlets

  • The specific technical proposals cited are EIP-8037 and EIP-8038.
  • Node operators are being instructed to revert to older software versions or install updated clients.
  • The Glamsterdam upgrade had a planned 200 million gas limit on the testnet.
  • The upgrade was already delayed from an original first-half 2026 schedule.

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