MANTRA Chain has resumed block production after an approximately 30-hour outage triggered by a vulnerability in an upstream Cosmos-EVM dependency. Mainnet returned at about 05:30 UTC on August 22 after validators coordinated an upgrade to version 8.4.0, restoring transactions and other network functions that had been unavailable since late August 20.
The halt froze normal activity across the RWA-focused Layer 1, including transfers, staking and MANTRA-managed cross-chain services. MANTRA said user balances were not altered and no rollback or blockchain-state rewrite was required during recovery. Two MANTRA-managed wallets were affected during the incident, while the project maintains that user funds were not compromised.
Version 8.4.0 Enables a Coordinated Network Restart
MANTRA’s official status page now lists the network as fully operational and confirms that mainnet has been producing blocks normally since the August 22 restart. Node operators rebuilding infrastructure are instructed to use v8.4.0, with updated post-upgrade snapshots available for recovery. Token holders do not need to migrate assets or take any other action following the restart.
The corresponding MANTRA Chain v8.4.0 release shows an update to the project’s Cosmos-EVM dependency alongside an emergency upgrade handler and additional circuit-breaker protections. The patch targeted the execution-layer software involved in the incident while preserving the existing mainnet state, allowing validators to restart without reversing previously finalized blocks.
Recovery required coordination across validators and other infrastructure providers rather than simply restarting a single service. Mainnet nodes, RPC infrastructure and supporting services had to converge on compatible software before normal operation could resume. That coordinated process reduced the risk of bringing only part of the validator set back online with incompatible execution logic.
Link to Earlier Cosmos-EVM Flaw Remains Unconfirmed
The incident has also drawn attention to an earlier Cosmos-EVM vulnerability involving the ICS20 precompile. A GitHub security advisory published in March documented a critical state-handling flaw affecting versions before Cosmos EVM v0.6.0 and said 15 chains had been identified as running code containing the issue. That earlier vulnerability could allow the same token balance to be reused during certain nested execution paths and was permanently patched in v0.6.0.
MANTRA was among the ecosystem teams acknowledged in that earlier remediation process. However, neither MANTRA nor Cosmos Labs has publicly confirmed that the August outage resulted from the same ICS20 vulnerability, making it premature to treat the two incidents as technically identical.
MANTRA has said a fuller post-mortem will follow, which should clarify the exact attack path, the upstream component involved and how the two managed wallets were affected. The network is operational again, but the definitive security assessment will depend on that technical disclosure rather than the successful restart alone.