Hack history / 2026 / Hack or exploit
Thetanuts Finance
Hack or exploit on Jun 15, 2026 · Rounding Error
ATTACK TX CONFIRMED ON CHAINSOURCES AGREE ON DATE AND LOSS · 3 SOURCES
Lost
$105K
dollars at the time
Returned
none listed
as the sources state it
Rank
#1,701
among thefts by dollars lost
What happened
A deprecated Thetanuts Finance Index Vault was exploited through an integer-division rounding flaw in its mint accounting. Using a flash loan, the attacker reduced the index token supply to a minimal level and repeatedly minted replacement shares while required underlying-token deposits rounded to zero, allowing the attacker to retain assets redeemed from the vault. The attacker extracted 105,471.499078 USDC plus residual option-token positions. About one hour later, a whitehat used the same vulnerability to secure approximately $2M of assets from another vulnerable legacy vault
Details
- Date
- Jun 15, 2026
- Kind
- Hack or exploit
- Method
- Rounding Error
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Ethereum
After the theft
- Recovered or seized
- yes, amount not stated
“A whitehat recovered most funds (~$2M), resulting in a net loss of around $105K according to the project.” (SlowMist Hacked)
Reported by
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Balancer V1 2026 · Hack or exploit · $234K
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Cite this page
SwanBluechip, "Thetanuts Finance hack, Jun 15, 2026: $105K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/htb92d260545/ (data as of 2026-10-31).