Ethereum developers agreed on October 22, 2026, to cancel Glamsterdam’s planned October 26 activation on the Hoodi test network after reviewing security findings. Chainsecurity identified 13 deployed smart contracts that could enter potentially permanent failure states under proposed changes to how gas is calculated. The affected contracts have not been publicly named while responsible disclosure continues.
Hoodi operators must install updated software before testing can proceed, but mainnet users need take no action. No replacement test date or mainnet launch has been confirmed, leaving the tentative December launch uncertain.
