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Arbitrum pauses new Stylus activations over AI-assisted attack risks

Existing programs keep running, while a separate proof-conflict guard can delay unconfirmed withdrawals to Ethereum.

Liam 'Akiba' WrightCryptoSlate · October 3, 2026 · 1d ago

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Key points

  • Arbitrum's Security Council blocked new Stylus contract activations on Arbitrum One and Nova in an October 2 emergency action, leaving active Stylus apps and Solidity contracts unaffected.
  • The Council cited increasingly sophisticated AI-assisted attacks using hand-crafted WebAssembly programs, saying known Stylus bugs mainly threaten chain liveness and no fund-theft attack was found.
  • The same action added a BoLD one-step proof guard that could hold Arbitrum One's settlement to Ethereum, delaying unconfirmed withdrawals; no reopening date was given.

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