Ethereum core developers have paused the deployment of the Glamsterdam upgrade on the Hoodi testnet following smart contract security findings. An October 13, 2026 audit by ChainSecurity revealed that Ethereum Improvement Proposals EIP-8037 and EIP-8038 alter gas pricing rules, threatening contracts reliant on fixed gas budgets and reserves when external calls fail. The Ethereum Foundation confirmed the Hoodi fork remains on hold without a confirmed mainnet activation date while checks proceed.
Glamsterdam testnet upgrade paused over risks
- ▪Ethereum core developers delayed the implementation of the Glamsterdam upgrade on the Hoodi testnet until security concerns involving eight smart contract invariants are resolved
- ▪The Ethereum Foundation stated that the Hoodi testnet fork of the Glamsterdam upgrade will not proceed until smart contract gas issues are resolved
- ▪The implementation of the Glamsterdam upgrade on the Ethereum Hoodi testnet remains paused, with no confirmed mainnet activation date set as of November 6, 2026
Audits identify smart contract gas issues
- ▪An October 13, 2026 ChainSecurity report found EIP-8037 and EIP-8038 break smart contracts when external calls fail, tied to eight smart contract invariants
- ▪The Ethereum Foundation called for smart contract checks after security audits raised concerns regarding Glamsterdam upgrade proposals
Glamsterdam features and gas changes
- ▪The Ethereum Glamsterdam upgrade includes enshrined proposer-builder separation, block-level access lists, and gas pricing updates to advance layer-1 scaling
- ▪The Ethereum Foundation stated on November 6, 2026 that EIP-8037 and EIP-8038 change how gas is charged for certain operations
Glamsterdam testing and announcements
- ▪Ethereum's Glamsterdam upgrade deployed to the Sepolia testnet
- ▪The Ethereum Foundation outlined the Glamsterdam upgrade's layer-1 scaling features in a blog post published on September 28, 2026
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