Cosmos Labs Urges EVM Chains to Halt as Security Incident Spreads Cosmos Labs said an ongoing security incident involving the Cosmos EVM module has affected users, with its security and engineering teams advising contacted Cosmos EVM chains to have validators halt their networks

What happened

Cosmos Labs, the organization behind the Cosmos network, urged operators of certain compatible chains to stop them after a security problem was found. This problem let an attacker steal funds from the KiiChain network, taking a large amount of its tokens. The MANTRA network also paused its own operations for a while as a precaution.

Global impact / market context

This matters because it shows a weakness in a shared technology part used by several networks. When one part is broken, it can affect many different projects and the people who use them. The immediate effect is that some networks have stopped working, and people who hold those tokens cannot use them right now.

What to watch

1. Check if Cosmos Labs or the affected chains announce a fix for the vulnerability, because that would allow the paused networks to safely restart.
2. Watch for updates from the KiiChain team about their investigation, as this will show the full scale of the stolen funds and what they plan to do next.
3. See if MANTRA and other Cosmos EVM chains resume normal operations, as this will signal whether the immediate risk from the security breach has passed.

Evidence

• Cryptopotato.Com — Cosmos Labs Urges EVM Chains to Halt as KiiChain and TAC Attacks Raise Security Fears 2026-08-25T20:51:44+00:00
• AMBCrypto — Cosmos requests validators to 'halt their chains' after EVM breach: 148.3M KII lost 2026-08-25T10:15:46+00:00
• X - wublockchain — Recent incidents tied to Cosmos EVM have already hit MANTRA, which halted its mainnet for roughly 30 hours, and KiiChain, which said an attacker exploited a Cosmos EVM vulnerability 18 times and moved about 148.3 million KII. 2026-08-25T00:14:02+00:00
• X - wublockchain — Cosmos Labs Urges EVM Chains to Halt as Security Incident Spreads Cosmos Labs said an ongoing security incident involving the Cosmos EVM module has affected users, with its security and engineering teams advising contacted Cosmos EVM chains to have validators halt their networks 2026-08-25T00:13:32+00:00
• Incident timeline — Cosmos Labs Urges EVM Chains to Halt as KiiChain and TAC Attacks Raise Security Fears
• Incident timeline — Cosmos requests validators to 'halt their chains' after EVM breach: 148.3M KII lost
• Incident timeline — Recent incidents tied to Cosmos EVM have already hit MANTRA, which halted its mainnet for roughly 30 hours, and KiiChain, which said an attacker exploited a Cosmos EVM vulnerability 18 times and moved about 148.3 million KII.
• Incident timeline — Cosmos Labs Urges EVM Chains to Halt as Security Incident Spreads Cosmos Labs said an ongoing security incident involving the Cosmos EVM module has affected users, with its security and engineering teams advising contacted Cosmos EVM chains to have validators halt their networks