Arbitrum Developers announced on X that the ArbOS 32 upgrade has been completed on Arbitrum One, Nova, and Sepolia. If you are running nodes on these networks and have not yet upgraded, please upgrade your nodes to at least Arbitrum Nitro v3.2.0 immediately. For Validator nodes, please upgrade to v3.2.1.
This upgrade was coordinated with the Security Council, which approved an emergency action to address (1) an incorrect pricing issue in Arbitrum Stylus, which could lead to a denial of service attack; (2) an issue that allows malicious contracts to cause node crashes; and (3) an incorrect pricing issue where the Stylus contract was overcharged for SLOAD operations. No funds are at risk.
In addition, the team will soon release a full analysis report.