Arbitrum Pauses New Stylus Activations in Emergency Security Action

Arbitrum has implemented an emergency security action that pauses the activation of new Stylus contracts on the network. The pause does not affect Stylus contracts that are already active: those contracts can continue executing and are able to renew as usual.

Alongside the activation pause, Arbitrum deployed a new BoLD guard. According to the update, the BoLD guard has the potential to delay withdrawals that are still unconfirmed in cases where contradictory proofs are accepted. The announcement frames this as a security-oriented measure tied to how proofs and withdrawal finality are handled.

The change is positioned as a protective step rather than a network shutdown: ongoing contract activity continues, while onboarding of new Stylus instances is temporarily halted. The introduction of the BoLD guard alters the processing path for certain withdrawal scenarios, potentially creating additional delay when proof conflicts arise.

Arbitrum’s communication emphasizes maintaining operational continuity for existing contracts while addressing a security concern through the pause and the new guard mechanism. Further details on the conditions that triggered the emergency action or the exact criteria for when the BoLD guard will delay withdrawals were not included in the briefing.