Ethereum developers have delayed the planned Glamsterdam hard fork on the Hoodi testnet after security researchers identified risks linked to proposed changes to the network’s gas rules. The upgrade had been scheduled for Oct. 26, but the Ethereum Foundation said more time was needed to assess how the proposals could affect smart contracts already deployed on Ethereum.
According to Cointelegraph, the concerns center on Ethereum Improvement Proposals EIP-8037 and EIP-8038. These proposals change aspects of how gas—the computational fee and execution limit used by transactions and smart contracts—is handled when an operation fails.
Why the gas changes matter
ChainSecurity said the proposed rules could return gas to a contract after a failed operation. In some cases, that could allow the contract to continue executing when it would previously have stopped. The researchers warned that this behavior may interfere with security checks designed around the amount of gas remaining during a transaction.
The potential issue involves so-called insufficient gas griefing. In this type of attack, a malicious caller supplies too little gas for a legitimate operation to complete. Existing safeguards may detect the failure and preserve the user’s ability to try again, but ChainSecurity said Glamsterdam’s changes could undermine some of those protections.
One possible consequence would be a contract permanently recording an unsuccessful operation. For example, a user’s claim could be removed even though the transaction did not complete, or the contract could prevent the user from retrying the action.
ChainSecurity stressed that the upgrade would not automatically make every gas-related safeguard unreliable. However, developers would need to review their contracts and confirm that their security logic remains valid under the new rules.
Testing delay adds uncertainty to mainnet plans
The findings have prompted a broader review of the Glamsterdam upgrade. On Oct. 21, pseudonymous security researcher pcaversaccio described the risks as serious in a GitHub discussion and called for the hard fork to be reassessed.
ChainSecurity later said it had found 13 real-world examples of smart contracts that could potentially be affected. The firm did not identify the projects or publish the details, saying it was coordinating responsible disclosure with the affected teams. It urged developers to examine their contracts promptly.
The delayed Hoodi deployment was an important step in Ethereum’s testing process. Developers had been considering an early-December mainnet timeline, but that schedule was dependent on successful testing on Hoodi. The postponement means the timetable now remains uncertain.
Glamsterdam had already raised concerns beyond smart-contract security. An earlier Ethereum Foundation warning said the new gas model could disrupt wallets, indexers and gas-estimation tools that depend on fixed assumptions. The upgrade was activated on the Sepolia testnet on Oct. 6, before the planned Hoodi launch.
Current market picture
Moneyiar data at 08:09 on Oct. 24, 2026, shows Ethereum at $2,369.763167491, down 1.25% over 24 hours and 2.51% over seven days. Shiba Inu was $0.0000049178, down 2.45% in 24 hours and 3.11% over seven days.
Uniswap stood at $6.8378123305, declining 5.34% over 24 hours and 6.22% over seven days. Pepe was $0.000004415, down 4.54% over 24 hours but up 10.49% over seven days.
