# One Unflagged Cosmos Patch Preceded Four Chain Drains and a Wave of New Exploit Reproductions

An underflow in the Cosmos EVM staking precompile, combined with two undisclosed defects, let attackers strip treasuries from MANTRA, TAC, KiiChain and Nesa, with KiiChain alone losing roughly $9.7 million.

- Published: 2026-09-10T05:53:21.186Z
- Canonical: https://polylog.news/crypto/2026-09-10/one-unflagged-cosmos-patch-preceded-four-chain-drains-and-a
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [Rekt News](https://www.rekt.news/), [DeFiHackLabs (Enso)](https://github.com/SunWeb3Sec/DeFiHackLabs/commit/fb6f9781db9ce477f1caed93369e63e7cb46a88c), [DeFiHackLabs (Unistreet)](https://github.com/SunWeb3Sec/DeFiHackLabs/commit/06b3631f1f184bbc2086683cc1a8770a6ed22104), [DeFiHackLabs (AIC)](https://github.com/SunWeb3Sec/DeFiHackLabs/commit/66cb979fc86e05c56c5bda1aaa0e5372f92d0523)

Rekt News has now published reconstructions of all four chains hit through the same shared dependency. The root cause sits in the Cosmos EVM module, where the staking precompile (built-in code that lets the module carry out staking operatio…

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