A suspected exploit on Harmony Protocol resulted in unauthorized minting of about 4 billion ONE (≈26% of total supply), with roughly 2.8 billion ONE moved to exchanges and the token plunging more than 30%. Harmony is working with exchanges to freeze funds, has identified four wallet groups, and is developing a patch and evaluating a rollback, but the vulnerability and final amount involved remain unconfirmed, raising systemic crypto and token inflation risks.

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Harmony Protocol has been hit by a suspected exploit that resulted in the unauthorized minting of about 4 billion ONE tokens, equivalent to roughly 26% of the token’s total supply, according to on-chain analyst Juiceberg.

The attack sent ONE down more than 30% as the newly minted tokens were moved through the network and into cryptocurrency exchanges.

How the Harmony Hack Happened

The exploit appears to have involved unauthorized minting of ONE through empty blocks, according to on-chain data cited by Juiceberg.

Harmony exploited as on-chain data reveals unauthorized 4B ONE mint (26% of supply) via empty blocks, with 2.8B quickly funneled to exchanges as price crashed while totalSupply endpoint hides the inflation $ONE
— Juiceberg (@the_juice_berg) August 12, 2026

About 4 billion ONE was reportedly created without authorization. The amount represents roughly 26% of the token’s total supply.The newly created tokens were then moved from the addresses involved in the exploit. Around 2.8 billion ONE was reportedly transferred to cryptocurrency exchanges, where it could be sold. About 115 million ONE remained on-chain, according to the available on-chain data.

Harmony has not yet disclosed the exact vulnerability that allowed the unauthorized minting to take place. The team also has not confirmed the final amount involved.

Harmony Asks Exchanges to Freeze Funds

Harmony said it is working with its team and cryptocurrency exchanges to stop and freeze funds linked to the exploit. The project identified four groups of wallet addresses and asked exchanges to block funds traced to those addresses. The addresses include both Harmony’s ONE network addresses and Ethereum addresses linked to the movement of funds.

We are asking all exchanges to block and freeze funds that traces back to these 4 wallet addresses:

one1uap8dx2z0qsjxqthm5flgcxkeepsz3gsrghnfn
0xe7427699427821230177dd13f460d6ce43014510

one17u300a40ll5wphd8kj5hktryhdjq3ml9f4phy4
0xf722f7f6afffe8e0dda7b4a97b2c64bb6408efe5… https://t.co/wiR6uQOazW
— Harmony 💙 (@harmonyprotocol) August 12, 2026

Harmony said it is developing a patch to address the issue and is evaluating rollback options. A rollback could allow the network to reverse or restore affected transactions, although Harmony has not confirmed whether it will proceed with one. The team said it will provide further updates as more information becomes available.

ONE Price Falls More Than 30%

The large increase in the token supply triggered heavy selling pressure on ONE. The token fell more than 30% as billions of newly minted ONE moved through the network and toward exchanges. If a large portion of the remaining tokens is sold, further selling pressure could follow.

Read the article at Coinpedia