Hack history / 2026 / Hack or exploit
Set Protocol
Hack or exploit on Oct 6, 2026 · Rounding Error
IN REVIEWSOURCES DISAGREE ON DATE OR LOSS · 3 SOURCES
Lost
$22K
sources: $14K to $22K
Returned
none listed
as the sources state it
Rank
#2,108
among thefts by dollars lost
What happened
ETHMACOAPY’s actualizeFee() rounded redemption backing upward even when no fee was payable. Attackers donated collateral to trigger recalculation, temporarily acquired Set tokens, then redeemed them for more collateral than they contributed, with the difference coming from existing holders’ backing. Two separate EOAs repeated the process across two transactions, draining approximately 8.11 WETH
In review: possible duplicate within one source; sources disagree on the loss.
Details
- Date
- Oct 6, 2026
- Kind
- Hack or exploit
- Method
- Rounding Error
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Ethereum
Reported by
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Cite this page
SwanBluechip, "Set Protocol hack, Oct 6, 2026: $22K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/hta77d513164/ (data as of 2026-11-01).