TAC, a Layer 1 blockchain, said an attacker exploited a vulnerability in the Cosmos EVM precompile layer on Aug. 22 and moved funds out of a single account. The team said it halted on-chain operations at block height 24,671,475 to stop the attack from continuing. According to TAC, the issue was not caused by chain-specific code. It said the bug exists in a shared Cosmos EVM module and that other chains using the same module were hit by similar attacks within the same day. TAC also said the incident was a transfer of funds rather than unauthorized minting, and that total supply did not change. About 2.986 billion TAC were moved from one account to another, while no other on-chain assets were affected. The team is finishing a technical post-mortem and a restart plan, which it expects to release tomorrow. That plan will include balance corrections for TAC accounts affected by the exploit, along with required Cosmos-side fixes. TAC said it is also working with SEAL 911 and relevant exchanges to trace the moved funds.
TAC, a Layer 1 blockchain, said an attacker exploited a vulnerability in the Cosmos EVM precompile layer on Aug. 22 and moved funds from a single account. The team said it halted on-chain operations at block height 24,671,475 to prevent the attack from continuing.
Bug tied to a shared Cosmos EVM module
TAC said the vulnerability was not specific to TAC code. Instead, it exists in a shared Cosmos EVM module. The project added that other chains running the same module were also hit by similar attacks within the same day.
About 2.986 billion TAC were moved
The team said the incident involved a transfer of funds, not token minting, and that TAC's total supply remains unchanged. About 2.986 billion TAC were moved from one account to another. TAC said only the TAC token was affected and that no other on-chain assets were impacted.
Restart plan expected tomorrow
TAC said it is completing a technical review and a restart plan, which it expects to publish tomorrow. The plan will include corrective adjustments for TAC balances made abnormal by the attack, as well as necessary Cosmos fixes.
The team said it is currently working with SEAL 911 and relevant exchanges to trace the moved funds.
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