Ethereum developers have postponed the Glamsterdam upgrade on the Hoodi testnet after security researchers identified potential risks to existing smart contracts. The activation, previously scheduled for October 26, was canceled while ETH traded below $2,400, and the Ethereum Foundation has not announced a new test date. ChainSecurity, a smart contract auditing firm, flagged 13 real-world cases of potential security risks tied to the upgrade's gas accounting changes.

Glamsterdam Misses Its October 26 Target

The Ethereum Foundation announced the decision on October 22 following a developer meeting. The review centers on EIP-8037, which changes gas charges for creating blockchain data and could affect already deployed contracts. Gas accounting sets how much computation each operation may consume, which is why adjustments to it can reach contracts deployed under earlier rules.

Ethereum postpones the Glamsterdam upgrade and cancels Monday's Hoodi testnet activation after security developers flagged risks to existing contracts. Just another reminder that protocol upgrades can be fragile.

— lenny (@blockchainlenny) October 23, 2026

The postponement removes the Amsterdam and Gloas activations — the two components packaged as Glamsterdam — from Hoodi's configuration, together with a planned increase in the testnet's gas limit to 200 million. According to the Foundation, existing transactions and Hoodi's chain history remain unchanged.

Security Review Focuses on Failed Contract Calls

On October 13, ChainSecurity warned that EIP-8037 and EIP-8038 could alter how failed transactions are handled. Certain contracts check their remaining gas to decide whether an unsuccessful operation should halt or continue, and older contracts may rely on those checks for their security.

Under the proposed rules, failed operations might leave contracts with enough gas to continue. In that scenario, an application could record a failure without allowing retries, potentially blocking users from resubmitting their requests.

ChainSecurity identified 13 real-world examples of contracts that could face such problems. The firm has not named the affected applications, saying it has contacted the relevant projects privately. A separate report on Glamsterdam gas concerns examined the findings, and developers are now assessing whether the rules need to be changed.

Hoodi Operators Await a New Testing Schedule

Glam activated on the Sepolia testnet on October 6, and Hoodi was the next planned testing stage ahead of mainnet deployment. Developers have not confirmed a December mainnet launch. With no replacement date announced, Glamsterdam's path to mainnet has no published testing timetable, and a rescheduled Hoodi activation together with any revision to EIP-8037's rules are the developments to follow before a mainnet date can be set.

Hoodi node and validator operators must check updated software instructions before October 26, as both client types must remove the canceled activation from their configurations. Mainnet users and ETH holders need to take no action, according to the Foundation.

Ethereum Price Holds Near $2,400

ETH traded between $2,370 and $2,415 during the reported session, declining around 0.5%. Separately, a Bitwise report found that Ethereum holders staked 35.9% of the total supply in the third quarter.

ETH remains near $2,400. An earlier Ethereum support analysis identified $2,350 as another level to watch. The price levels reflect market trading rather than a confirmed response to the Hoodi decision. A move above $2,415 would clear the reported range, while a fall below $2,370 would mark renewed selling pressure.