TAC, an EVM network connected to TON, halted validator block production after an exploited vulnerability on its Cosmos-based EVM side, with the team claiming only the native TAC token supply was affected. The halt was announced on Aug. 22 and implemented within minutes after coordination with validators. Explorer data showed the latest block remained 24,671,475, timestamped at 11:58:11 p.m. UTC on Aug. 22, unchanged through a check around 7:58 a.m. UTC on Aug. 24.
The project did not immediately disclose the unauthorized TAC amount, a dollar loss figure, the exploit transaction or block height, the vulnerable component, affected wallets, user losses, or a restart timetable. It also did not explain why the issue could not be isolated below the full-chain level. The halt has raised an unresolved state-reconciliation question over whether native, wrapped, bridged, staked, exchange-held, or protocol-controlled TAC balances must be checked before validators agree on a canonical state.
Two days after the initial notice, the team said the attacker gained access through a gap and emptied a single account before the network stopped. TAC placed the flaw in the Cosmos EVM precompile layer, a shared module, rather than its own codebase, noting that several other chains run the same code. This broadens the potential relevance beyond TAC holders to other projects building on Cosmos EVM chains.
The August incident differs from TAC's separate May 11 bridge breach. In its May 20 post-mortem, TAC said its sequencer software failed to verify the code hash of a TON jetton wallet and the expected minter behind it, allowing counterfeit deposit messages to be accepted and unbacked equivalents to be issued on TAC while genuine assets locked on TON were released. The May loss was approximately $2,854,486.22 as of May 12, and the team temporarily halted the sequencer set connecting TAC to TON while saying the TAC EVM layer remained operational.
After the latest exploit, TAC's token bounced roughly 53% from its Aug. 22 all-time low of $0.001129, trading between $0.001626 and $0.001894 over 24 hours. Even so, the token remains 97.4% below its June 30 peak of $0.06688. At the time of writing, TAC had a market cap of about $8.3 million, 24-hour trading volume of $2.46 million, a CoinMarketCap rank of #1007, and a circulating supply of around 4.8 billion tokens.
The project has now faced three major scares in four months. After the May bridge attack affected USDT, BLUM, and tsTON balances, TAC reclassified the incident as white-hat activity after recovering about 90% of funds and reopened TON-TAC bridge transfers on June 10. The token later fell around 82% to about $0.0056 on July 7 without explanation. The current 53% bounce therefore leaves TAC near record lows, with no confirmed restart timetable or reconciled supply figure for the latest exploit.
