Ethereum cancels Glamsterdam upgrade on Hoodi testnet after 13 security risks found in gas accounting changes
Ethereum developers cancelled the October 26 Glamsterdam testnet upgrade on Hoodi after ChainSecurity identified 13 smart contracts at risk from proposed gas accounting changes.
Why it matters
The postponement delays Ethereum's next major protocol upgrade and raises uncertainty about the mainnet timeline. The gas accounting changes affect fundamental transaction execution guarantees that DeFi protocols rely on, requiring thorough testing before deployment.
Key facts
Ethereum Foundation scheduled Glamsterdam upgrade for Hoodi testnet on October 26, 2026 at 17:42:48 UTC
Reported by CryptoSlate
The upgrade would raise Hoodi's block gas limit to 200 million, matching Sepolia testnet
200,000,000 gasReported by CryptoSlate
Glamsterdam includes enshrined proposer-builder separation (ePBS) and block-level access lists
Reported by NewsBTC
Ethereum Foundation cancelled the October 26 Hoodi activation on October 22
Reported by CryptoSlate
EIP-8037 and EIP-8038 gas accounting changes could alter how existing contracts handle failed transactions
Reported by Crypto.News
No replacement date announced for Hoodi testnet or mainnet activation
Reported by CryptoSlate
Mainnet activation timing remains undecided
Reported by CryptoSlate
What happened
Ethereum Foundation originally scheduled the Glamsterdam upgrade for the Hoodi testnet on October 26 at 17:42:48 UTC, which would have raised the gas limit to 200 million and introduced enshrined proposer-builder separation and block-level access lists. On October 22, during an All Core Developers Execution meeting, developers agreed to postpone the activation after ChainSecurity researchers warned that EIP-8037 and EIP-8038 gas accounting changes could alter how existing smart contracts handle failed transactions, potentially making errors permanent. ChainSecurity identified 13 real-world affected contracts and is coordinating responsible disclosure. No replacement date has been announced for Hoodi or mainnet, leaving previously considered early December targets unconfirmed.
How the story developed
- Update
ChainSecurity warns of gas-related security risks
Identified EIP-8037 and EIP-8038 could weaken safeguards against insufficient gas griefing
- Official statement
Ethereum Foundation announces Glamsterdam Hoodi testnet date
Scheduled for October 26, 2026 at 17:42:48 UTC with 200 million gas limit
- First report
First report by CryptoSlate
Ethereum sets October 26 for Hoodi’s 200 million gas test
- Independent corroboration
Independently corroborated by NewsBTC
Ethereum Sets October 26 Hoodi Test For Glamsterdam Upgrade As 200M Gas Limit Nears
- Official statement
All Core Developers Execution meeting agrees to postpone
Developers decided to investigate how gas changes interact with existing mainnet contracts
- Correction
Ethereum Foundation confirms cancellation of October 26 Hoodi activation
Node operators instructed to revert to older software or install updated clients removing the activation
How coverage built up
Independent sources over time, counted the way the consensus panel counts them: a republication of a wire story does not move the line.
- 17 Oct 2026, 17:00 UTC: CryptoSlate — 1 independent source, 1 reports
- 19 Oct 2026, 17:00 UTC: NewsBTC — 2 independent sources, 2 reports
- 20 Oct 2026, 16:44 UTC: Crypto News (CryptoNews.net) — 3 independent sources, 3 reports
- 21 Oct 2026, 11:29 UTC: CoinGape — 4 independent sources, 4 reports
- 23 Oct 2026, 04:38 UTC: Crypto.News — 5 independent sources, 6 reports
- 23 Oct 2026, 04:59 UTC: CoinDesk — 6 independent sources, 7 reports
- 23 Oct 2026, 05:09 UTC: Cointelegraph — 7 independent sources, 8 reports
Affected entities
Original sources
Related events
VanEck Withdraws Lido stETH ETF Registration After a Year With No Shares Sold
VanEck Digital Assets asked the SEC on October 14, 2026 to withdraw the S-1 for its proposed Lido stETH ETF, filed October 16, 2025, saying it no longer intends to distribute the trust's shares.
Interactive Brokers launches Ethereum staking through Zerohash partnership
Interactive Brokers introduced Ethereum staking for eligible clients via Zerohash, adding crypto rewards to its brokerage platform.
Lido DAO executes votes 205, 206 and 214 on delegation, staking router and dual governance
Lido DAO executed three onchain governance packages in September 2026 covering execution delegation, staking-router parameters and dual governance, plus a deposit reserve change.
LDO, AAVE, and NVDA Technical Analysis Shows Momentum Exhaustion at Bollinger Band Extremes
Blockchain.News reported that LDO, AAVE, and NVDA each face stalled momentum near their upper Bollinger Bands with MACD histograms flatlining at zero.
MetaMask Exits Lido Validators After Infrastructure Compromise; Researchers Put Diverted Rewards at 0.36 ETH
MetaMask said a security incident hit part of its infrastructure and it is exiting affected Lido Ethereum validators, while a researcher estimates 0.36 ETH of block tips was diverted.
