Hack history / 2026 / Hack or exploit
Ostium
Hack or exploit on Jul 15, 2026 · Private Key Compromised
SOURCES DISAGREE ON DATE OR LOSS · 4 SOURCES
Lost
$23.8M
sources: $18M to $24M
Returned
none listed
as the sources state it
Rank
#188
among thefts by dollars lost
What happened
On July 15, 2026, Ostium perpetuals DEX on Arbitrum suffered a $23.75M exploit when an attacker used a compromised price oracle private key to sign fraudulent Bitcoin price reports ($5,000 vs. real ~$60,000), opening positions at fake prices and closing at market rates.
Details
- Date
- Jul 15, 2026
- Kind
- Hack or exploit
- Method
- Private Key Compromised
- How in
- Keys, accounts and infrastructure
- Target
- DeFi protocol
- Chains
- Arbitrum
Related incidents
Step Finance 2026 · Hack or exploit · $40M
Humanity 2026 · Hack or exploit · $32M
KITE Foundation 2026 · Hack or exploit · $13.3M
Volo Vault 2026 · Hack or exploit · $3.5M
Fogo Foundation 2026 · Hack or exploit · $3M
Humanity 2026 · Hack or exploit · $32M
KITE Foundation 2026 · Hack or exploit · $13.3M
Volo Vault 2026 · Hack or exploit · $3.5M
Fogo Foundation 2026 · Hack or exploit · $3M
Cite this page
SwanBluechip, "Ostium hack, Jul 15, 2026: $23.8M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/htca312b4dc1/ (data as of 2026-10-31).