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Security flaw in Cosmos EVM leads to multiple token drains and network halts across chains

Pluang • August 25, 2026

In August 2026, Cosmos Labs issued an emergency halt for all Cosmos EVM-based blockchains following a major security breach. KiiChain lost over 148 million KII tokens through 18 attacks exploiting vulnerabilities in vesting and staking mechanisms. TA...

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Cosmos EVM Module Security Incident Halts Multiple Chains On August 24, 2026, Cosmos Labs confirmed a security incident affecting its EVM module, prompting affected chains, including KiiChain, TAC, and MANTRA, to halt operations. KiiChain reported a significant loss of 148,326,583.15 KII tokens due to an attacker exploiting vulnerabilities in the shared module. TAC experienced a similar incident, draining a single account before halting its chain. MANTRA halted its operations as a precaution and later resumed after deploying a patch. Cosmos Labs has not disclosed specific vulnerability details or the total losses incurred. The situation follows earlier security issues in 2026, including a $7 million exploit in January. A full incident report is expected once the investigation concludes, and affected networks are advised to coordinate validator upgrades. The incident has raised concerns about the security of the Cosmos EVM infrastructure. 23 sources 69

Security flaw in Cosmos EVM leads to multiple token drains and network halts across chains

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