--- title: "Ethereum postpones Glamsterdam upgrade on Hoodi testnet over contract risk" description: "Ethereum developers called off the Glamsterdam activation on the Hoodi testnet, scheduled for Oct. 26, after CoinDesk reported security concerns about how new gas rules could affect existing smart contracts. ChainSecurity said it found 13 real-world examples of contracts potentially affected by the…" language: en canonical: "https://whycoinmoves.com/en/events/ethereum-ethereum-delays-glamsterdam-test-after-c241dfc26e7def" published: 2026-10-23T05:07:19.000Z updated: 2026-10-23T06:08:29.000Z indexable: true --- # Ethereum postpones Glamsterdam upgrade on Hoodi testnet over contract risk Ethereum developers called off the Glamsterdam activation on the Hoodi testnet, scheduled for Oct. 26, after CoinDesk reported security concerns about how new gas rules could affect existing smart contracts. ChainSecurity said it found 13 real-world examples of contracts potentially affected by the… Attributed sources: [CoinDesk](), [Cointelegraph]() ## Key facts Ethereum developers called off the Glamsterdam activation on the Hoodi testnet, scheduled for Oct. 26, after CoinDesk reported security concerns about how new gas rules could affect existing smart contracts. ChainSecurity said it found 13 real-world examples of contracts potentially affected by the gas changes and is coordinating responsible disclosure, per Cointelegraph. A planned gas limit increase to 200 million was also postponed. Evidence strength: Multiple publishers, 2 publisher group(s) (CoinDesk, Cointelegraph); this describes source coverage, not truth or causation. After site detection, observed returns were 5 minutes: +0.18% (difference from BTC +0.08 pp; 23/10/2026, 05:07 → 23/10/2026, 05:12, UTC; Gate · USDT); 1 hour: +0.24% (difference from BTC +0.11 pp; 23/10/2026, 05:07 → 23/10/2026, 06:08, UTC; Gate · USDT). Unlisted windows are unavailable. In the preceding 30 days, the 99th percentile of absolute hourly returns was 1.46% (OKX · USDT; cutoff 23/10/2026, 05:07, UTC). This hourly baseline is not directly comparable with a minute move. ## Returns after site detection | Window | Return | BTC | Difference from BTC | Actual sampled interval (UTC) | Source | | --- | --- | --- | --- | --- | --- | | 5 minutes | +0.18% | +0.11% | +0.08 pp | 23/10/2026, 05:07 → 23/10/2026, 05:12 | Gate · USDT | | 1 hour | +0.24% | +0.13% | +0.11 pp | 23/10/2026, 05:07 → 23/10/2026, 06:08 | Gate · USDT | | 24 hours | — | — | — | — | — | ## Historical hourly baseline | Metric | Value | | --- | --- | | Ready | true | | Coverage | 100.0% (720/720) | | Median absolute hourly return | 0.19% | | 99th percentile of absolute hourly returns | 1.46% | | BTC beta | 1.19 | | Source / cutoff (UTC) | OKX · USDT / 23/10/2026, 05:07 | ## Claims and open questions - CoinDesk reported that developers postponed the Hoodi activation during Thursday's All Core Devs Execution meeting to investigate how EIP-8037, a gas accounting change, interacts with contracts already running on mainnet. - CoinDesk reported that ChainSecurity's Oct. 13 analysis showed that, combined with EIP-8038, creating a new storage slot could require 110,020 gas when a separate allowance is exhausted, compared with 22,100 under the old rules. - Cointelegraph reported that ChainSecurity identified 13 real-world examples of smart contracts potentially affected by Glamsterdam's gas changes and is coordinating responsible disclosure with affected projects. - When developers will reschedule the Hoodi activation and the accompanying increase of the testnet gas limit to 200 million, and what fix or mitigation they adopt, would be confirmed by an official All Core Devs statement or Ethereum Foundation notice. - Whether any of the 13 examples flagged by ChainSecurity involve a major production protocol that is actually exploitable, beyond the demonstrated mechanism, would be confirmed by ChainSecurity's disclosure or affected-project statements. ## Source evidence - [Ethereum delays Glamsterdam test after security devs flag risk to existing contracts]() — CoinDesk; published 23/10/2026, 04:59; received 23/10/2026, 05:07 (UTC). - [Ethereum delays Glamsterdam Hoodi testnet launch over security risks]() — Cointelegraph; published 23/10/2026, 05:09; received 23/10/2026, 05:13 (UTC). ## Recent ETH events and market reactions - [Ethereum developers postpone Glamsterdam upgrade on Hoodi testnet]() — Published 22/10/2026, 00:00 (UTC) · Official source (1 publisher) · General news · 5m -0.08% / 1h +0.06% - [Drift exploit-linked wallets move Ether into Tornado Cash]() — Published 20/10/2026, 12:38 (UTC) · Multiple publishers (2 publishers) · Security · 5m +0.01% / 1h -0.15% / 24h +2.97% - [Bitmine adds 12,535 ETH, reaching 6.04 million tokens in treasury]() — Published 19/10/2026, 15:13 (UTC) · Multiple publishers (2 publishers) · General news · 1h -0.30% - [JPMorgan deploys JPM Coin deposit token on Ethereum mainnet]() — Published 19/10/2026, 17:31 (UTC) · Multiple publishers (4 publishers) · General news · 5m -0.03% / 1h -0.39% - [Ethereum postpones Glamsterdam activation on Hoodi testnet]() — Published 16/10/2026, 00:00 (UTC) · Official source (1 publisher) · Project updates · 1h -0.43% - [Full coin archive]() ## Research for this archive - [Altcoin beta to Bitcoin: BTC, ETH, SOL and DOGE hourly returns]() - [Perpetual funding rates and annualized yield: a 2025 comparison]() - [Crypto listing and delisting effects: an OKX price study]() - [XRP lawsuit and Ethereum ETFs: reading SEC filings and rulings]() [Methods and limitations]() Publisher count is not independent evidence count. Price changes cannot verify news or prove causation.