Cosmos EVM Module Security Incident Halts Multiple Chains

• •Cosmos Labs confirmed a security incident affecting its EVM module on August 24, 2026.
• •KiiChain lost over 148 million KII tokens due to repeated exploitation of vulnerabilities.
• •Affected chains, including TAC and MANTRA, were advised to halt operations while investigations continue.

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.