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MANTRA Chain software exploit and network halt

Updated 1 time since CLSTR started tracking revisions of this situation.

What changed

2026-08-28 07:48 UTC → 2026-08-28 21:16 UTC · added removed

MANTRA Chain, a Layer 1 blockchain, halted all network operations, including transactions, staking, and bridge operations, following a security exploit. The incident was attributed to a vulnerability in an upstream software dependency. The exploit caused significant market volatility, with the OM token dropping approximately 18.5% to an all-time low and trading volume increasing by nearly 600%. The network has since resumed mainnet operations using version v8.4.0. The vulnerability was traced to the Cosmos EVM module, which had been upgraded shortly before the incident. While the project team stated that no user funds were exploited, developers have raised concerns regarding a lack of transparency concerning specific transaction hashes and the exact attack route. Some developers also noted undocumented code changes Subsequent investigations revealed that the Cosmos EVM software stack exploit resulted in recent commits related to a loss of approximately $5.72 million across at least six networks, including MANTRA, TAC, and KiiChain. The vulnerability was identified as an “arithmetic underflow occurring when mirroring balances after staking operations.” Cosmos Labs reported that while the upgrade handler flaw was identified on April 25, engineers mistakenly believed production chains were safe because they used 18 decimals rather than the six-decimal format used during initial testing. This misjudgment left multiple networks exposed for months. While the Cosmos Hub and Go module dependencies. ATOM tokens were not directly targeted, the shared software layer allowed attackers to move significant funds. In response, Cosmos Labs contacted 40 networks, and several chains have since patched or halted operations to mitigate further risk.

Versions

  1. 2026-08-28 21:16 UTC MANTRA Chain software exploit and network halt
  2. 2026-08-28 07:48 UTC MANTRA Chain software exploit and network halt

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