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⚠️ It has just been decided to delay the Glamsterdam hard fork on the Hoodi testnet because of security impacts we identified in this blog post: chainsecurity.com/blog/glams…
We already found 13 real-world examples and are in responsible disclosure with the affected projects.
Please check your contracts as soon as possible, as the EF is determining how many contracts are impacted in which way.
Feel free to reach out to us with questions via [email protected].
ChainSecurity retweeted
Glamsterdam is bringing changes that could affect how existing smart contracts behave.
@chain_security has already identified 13 affected protocols.
Want to understand what could break and how to check your own code?
Join their workshop at the Security Hub during @EFDevcon on November 5 at 3:40 PM!
RSVP here: luma.com/uxs32jih
⚠️ It has just been decided to delay the Glamsterdam hard fork on the Hoodi testnet because of security impacts we identified in this blog post: chainsecurity.com/blog/glams…
We already found 13 real-world examples and are in responsible disclosure with the affected projects.
Please check your contracts as soon as possible, as the EF is determining how many contracts are impacted in which way.
Feel free to reach out to us with questions via [email protected].
In short: after Glamsterdam, some calls that used to fail out of gas can now complete, and contracts built on the old behavior can make the wrong call.
We're working with the EF and affected teams. If you're unsure about your code, reach out via [email protected]
🫡
Ethereum Delays Glamsterdam Testnet Fork Over Gas Security Flaws
decrypt.co/381681/ethereum-d…
🫡
Ethereum developers have unscheduled Glamsterdam's Oct. 26 activation on the Hoodi testnet. Christine D. Kim says the reason is security issues ChainSecurity found in the upgrade.
unchainedcrypto.com/ethereum…
We're happy our research could help here. A testnet delay is a lot cheaper than broken contracts on mainnet.
What changes and how to check your code ↓
chainsecurity.com/blog/glams…
ChainSecurity retweeted
Hoodi node operators: Besu says nodes on v26.10.0 will still activate Amsterdam on Oct. 26 unless they update. Developers had floated Dec. 1, 8 or 9 for Glamsterdam's mainnet launch if Hoodi went smoothly.
unchainedcrypto.com/ethereum…
ChainSecurity retweeted
ChainSecurity found 13 real-world examples affected by Glamsterdam gas changes, prompting a Hoodi fork delay as teams review failure handlers that could disable retries.
defiprime.com/glamsterdam-ho…
ChainSecurity retweeted
ChainSecurity identified 13 real-world examples of smart contracts that could be affected by Ethereum’s Glamsterdam gas changes.
Developers canceled the upgrade’s planned Hoodi testnet activation after a warning that contracts could permanently record failed operations.
ChainSecurity is coordinating responsible disclosure with affected projects. The reports do not say any contracts have been exploited, and no new Hoodi date has been announced.
This is a compatibility issue for applications already deployed—not just a question of whether a new upgrade works on a test network. If you use Ethereum apps, the next milestone is a revised Hoodi plan after developers assess the risk.
ALT Ethereum Delays Glamsterdam Hoodi Test After Researchers Flag Contract Risk
ChainSecurity retweeted
glamsterdam was supposed to hit the hoodi testnet monday.
core devs pulled it yesterday. no new date.
chainsecurity showed the new gas rules can change how live mainnet contracts handle failures.
testnet delays are cheap.
mainnet surprises aren't.
Core developers decided to delay the upcoming Hoodi hard fork on today's ACDE call.
Refer to this blog post for further details and be sure to watch for any client releases pertaining to your infrastructure on Hoodi.
blog.ethereum.org/2026/10/22…
ChainSecurity retweeted
ETHEREUM JUST PAUSED ITS GLAMSTERDAM TEST.
Ethereum called off the October 26 Glamsterdam test on the Hoodi test network after ChainSecurity warned that two proposed gas-pricing changes could break safeguards in existing contracts.
No new test date has been announced.
ChainSecurity retweeted
Doris Benda · DSS 2026
“How clean is your code? Dirty Bits in Solidity”
Explore the talk and add it to your agenda:
defisecuritysummit.org/2026/…
Tickets: luma.com/9qtxqqxx
ALT DSS 2026 speaker card for Doris Benda: How clean is your code? Dirty Bits in Solidity.
ChainSecurity retweeted
Glamsterdam testnet delayed. @chain_security found the new gas rules could change how existing contracts handle failed calls, so devs paused Hoodi to review it first. no new date yet
Security for institutions has been in our DNA since our days at PwC Switzerland in 2020.
If you're bringing assets, payments or treasury on-chain, Pietro is the person to talk to at Bluechip26.
📍 Vienna, Nov 10-11. DM us to talk.
🎙️ Pietro Carta (@PtrCarta) is speaking at Bluechip26, the Crypto Safety Conference!
Pietro is Partner & Senior Blockchain Engineer @Chain_Security, one of the longest-standing blockchain security firms, securing critical code & architecture across crypto since 2017.
Bluechip26 is the world’s first and leading conference dedicated to crypto safety. Get tickets at conference.bluechip.org.
📍 Nov 10-11 in Vienna
ChainSecurity retweeted
@chain_security team is going 🥰
How likely is an address collision attack at 2⁸¹ hashes?
- Some audit competition reports said 86%.
- In fact it is 63%.
Why? They apply the classic birthday-paradox formula, counting collisions that aren't useful to the attacker. We break down the correct model in this blog: chainsecurity.com/blog/addre…
We're always happy to bring a security perspective to the Vault Summit. This time in Singapore! 🔜
ChainSecurity is one of the longest-established blockchain security auditing firms, providing smart contract and blockchain security audits since 2017.
It serves the largest DeFi protocols, including Aave, Lido, Sky, and Polymarket, alongside institutions like Circle, banks, and regulated exchanges.
@Spittfires_, Blockchain Security Engineer at @chain_security, will take the stage at Vault Summit Singapore.
9 October · sg2026.vaultsummit.xyz
