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Ethereum cancels Hoodi testnet upgrade due to security risks in gas accounting changes

Protocol Fundamentals
22 Oct 2026
Unchained
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Bearish
Ethereum cancels Hoodi testnet upgrade due to security risks in gas accounting changes

Ethereum developers have canceled the planned activation of the Hoodi testnet upgrade, originally scheduled for October 26, after security firm ChainSecurity identified risks in the upgrade's gas accounting changes. These issues could cause certain operations to fail permanently even if contract code remains unchanged. The cancellation delays the selection of a mainnet upgrade date, which was dependent on a successful Hoodi test. Developers advised node operators to revert to older software versions or wait for updated clients. No new date for the Hoodi test has been announced yet.

Ethereum's planned Hoodi testnet upgrade cancellation comes as a backdrop to a broad market downturn. For readers following major cryptocurrencies, here is Pluang's market snapshot as of Oct 23, 2026 01:02 WIB: out of 50 major cryptocurrencies, 45 fell and only 4 rose. Notable moves include SXP down 46.27% at Rp37, BAL up 11.14% at Rp16.297, and FIL down 10.72% at Rp17.283 with a typical hold time of 100 days and a buy order activity of 76%.

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