By Isaac • October 3, 2026 7:31 am •
Arbitrum has temporarily shut the door on new Stylus contract activations across Arbitrum One and Nova after flagging a growing class of AI-assisted attack techniques.
The precaution is narrower than a network shutdown. Existing Stylus applications can continue running, ordinary Solidity contracts are unaffected, and developers can still extend an active program’s life through the network’s keepalive mechanism.
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What developers cannot do for now is activate a new WebAssembly program, reactivate one that has expired, or activate a version that needs fresh approval after a Stylus upgrade.
Arbitrum blocked new Stylus activations on One and Nova over AI-assisted attack risks. Existing programs and Solidity contracts can still run.
Arbitrum says no attack enabling theft of
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