ChainCatcher message, Arbitrum Developers stated that Arbitrum One, Nova, and Sepolia have completed the ArbOS 32 upgrade. Node operators need to upgrade their nodes to at least Arbitrum Nitro v3.2.0, and validator nodes need to upgrade to v3.2.1.This upgrade was coordinated with its Security Council, which approved an emergency action to address: the mispricing issue in Arbitrum Stylus that could lead to denial-of-service attacks; the issue that allows malicious contracts to cause node crashes; and the mispricing issue where Stylus contracts are overcharged due to SLOAD operations. No funds are at risk. Additionally, the team is about to release a comprehensive analysis report.

ChainCatcher message, Arbitrum Developers posted on the X platform stating that the Arbitrum Security Council is planning to take emergency action to activate ArbOS 32 in the coming days. Version v3.2.0 includes security fixes activated by the newly upgraded ArbOS 32, and the source code will be available at 10 AM Eastern Standard Time on Tuesday, after which the upgrade process will begin.Previously, Arbitrum Developers announced that Arbitrum Nitro v3.2.0 has been released, and relevant parties need to upgrade to this version as soon as possible.