The Arbitrum Security Council carried out an emergency upgrade on Arbitrum One and Nova on October 2, 2026, pausing all new Stylus contract activations on both chains. This measure targets hand-crafted WebAssembly programs that could be exploited as denial-of-service vectors ahead of upcoming ArbOS updates. Existing Stylus contracts remain operational and can be renewed. The identified vulnerabilities affect network liveness, not user fund safety, with no user funds currently at risk. The new BoLD guard added to the dispute resolution system could delay unconfirmed withdrawals if contradictory proofs are ever accepted.
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