MANTRA Chain resumes blocks after Cosmos-EVM fix

MANTRA Chain has resumed block production after deploying version 8.4.0 to fix a Cosmos-EVM vulnerability that kept its mainnet unable to process transactions for about 30 hours. Summary MANTRA Chain restarted at approximately 5:30 a.m. UTC on Aug. 22. Version 8.4.0 patched a Cosmos-EVM vulnerability and added security protections. Two MANTRA-managed wallets were affected, but user balances remained unchanged. MANTRA plans to publish a complete post-incident report in the coming days. MANTRA Chain said in an Aug. 22 post that its mainnet was producing blocks again after developers fixed the vulnerability found in its Cosmos-EVM module. The restart followed a coordinated software update involving MANTRA-operated validators and other members of the network’s validator set. According to the project’s incident status page, block production resumed at about 5:30 a.m. UTC on Aug. 22 through the patched v8.4.0 release. User balances were not changed during the incident, while the restart involved no blockchain rollback or alteration of the network state, the status update said. Token holders were also told that they did not need to take any action. You might also like: MANTRA price falls 10% as network halts transactions MANTRA Chain halted after an attacker targeted its EVM module The incident began late on Aug. 20, when MANTRA detected an attacker exploiting a vulnerability in an upstream software dependency used by the blockchain. Developers responded by halting the mainnet, preventing transactions from being processed while security teams investigated the activity. MANTRA’s initial notice said all transactions and network endpoints had been frozen. The shutdown also stopped transfers, staking operations, bridges and MANTRA-managed inter-blockchain communication relays, while some exchanges paused deposits and withdrawals connected to the network. As crypto.news reported on Aug. 21, the halt took validators, public endpoints and bridge services offline, leaving assets temporarily unable to move on the RWA-focused Layer 1. Later in the investigation, MANTRA traced the vulnerability to its Cosmos-EVM module and said the activity affected two wallet addresses before developers contained the threat. Its status page subsequently identified them as MANTRA-managed wallets and said there was no indication that user, exchange, or partner funds had been directly affected. “No user funds were exploited,” the project said in an update after identifying the source of the incident. MANTRA has not disclosed what activity occurred in the two managed wallets, how much value was involved, or whether any assets left the addresses. The project also has not released the attack path or named the specific upstream software component responsible for the vulnerability. Before beginning the restart process, the team took a complete snapshot of the blockchain at the halted state. Mainnet remained stopped at block 17,449,398 while developers reviewed known attack paths and prepared the patch.