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CryptoMediumUpdated×3•Originally published 2 October 2026•Updated 3 October 2026•
1 min read

Arbitrum Pauses New Stylus Activations in Emergency Security Action

Arbitrum logo with 'ARBITRUM STYLUS HALT' text, a red 'OFF' button, and warning signs on digital screens.

Key Facts

1Arbitrum has paused new Stylus activations as an emergency security measure to safeguard network stability.
2Existing Stylus contracts can continue running and renewing despite the suspension of new activations.
3The network added a BoLD guard which may delay unconfirmed withdrawals if contradictory proofs are accepted.

Arbitrum has paused new Stylus activations as an emergency security measure to safeguard network stability. Crypto Briefing reported that the action aims to prevent the deployment of unpatched programs that could be used as denial-of-service (DoS) vectors to impair network liveness.

Existing Stylus contracts can continue running and renewing despite the suspension of new activations. Additionally, the network introduced a BoLD guard mechanism, which may delay unconfirmed withdrawals if contradictory proofs are accepted, as part of proactive security measures for Arbitrum One and Nova.

Latest Updates · 2

  1. Notable·

    Update: The precautionary measure specifically targets a potential attack vector involving WebAssembly programs built with nonstandard Stylus compiler tools. This technical refinement aims to close vulnerabilities that these specific tools could exploit to compromise network stability.

  2. Notable·

    Update: Additional reports revealed that the suspension of new Stylus activations was implemented to counter specific risks associated with AI-assisted attacks. This proactive measure aims to shield the network's infrastructure from sophisticated exploitation methods targeting unpatched programs.