Arbitrum’s Security Council temporarily suspended new Stylus contract activations on Arbitrum One and Nova on October 2, including updates requiring fresh activation. Already-active Stylus programs continue running until expiration and keepalive renewal remains available, while ordinary Solidity contracts are unaffected. The precaution follows AI-assisted attacks involving hand-crafted WebAssembly programs outside the standard Stylus compiler toolchain. No attack permitting theft of user funds has been identified to date. The action was executed on October 2 around 15:30 to 15:31 UTC.
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