Cosmos EVM Security Incident Forces Multiple Blockchain Networks to Halt
TLDR
- Cosmos Labs urged affected Cosmos EVM chains to halt validators on Aug. 25 following an active security incident.
- KiiChain reported 148,326,583.15 KII drained across 18 repeated attacks on Aug. 22.
- TAC halted its network at block 24,671 after one account was drained via a Cosmos EVM precompile exploit.
- MANTRA resumed block production after roughly 30 hours and said user balances were unchanged.
- Cosmos Labs has not disclosed affected chains, vulnerability details, or total losses publicly.
Multiple blockchain networks built on the Cosmos EVM software stack were forced to halt operations in late August 2026 after Cosmos Labs identified an active security incident targeting its shared module.
An ongoing security incident has impacted users of the Cosmos EVM module. Cosmos Labsโ security and engineering teams have been proactively responding to this incident. We have advised the Cosmos EVM chains that are in contact with us to request that validators halt their chains.โฆ
- Cosmos Labs (@cosmoslabs_io) August 24, 2026
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