Allbridge exploited for $1.66 million
The Allbridge blockchain bridge was exploited for $1.66 million in a flash loan attack. The attacker took advantage of a flaw in the project's logic that reprices assets against one another, after discovering that the same would happen even when borrowing an asset against collateral denominated in the same token. They were able to manipulate the project's internal pricing logic so that the asset's actual price diverged away from reality, pocketing $1.66 million in proceeds.
Across Protocol exploited for $3.35 million
The Solana deployment of the Across bridge was hacked for around $3.35 million. According to Across, the stolen funds belonged to Risk Labs, the foundation supporting the project, rather than users of the bridge.
Ostium loses at least $24 million to oracle exploit
![A circle overlaid with ][ symbols, followed by "Ostium" in orange capitals](https://primary-cdn.web3isgoinggreat.com/entryImages/logos/resized/ostium_300.webp)
Decentralized perpetual futures exchange Ostium was drained of at least $24 million after an attacker manipulated its oracle system — a system that pulls in off-chain price data. After the attacker apparently gained access to the private key used to sign oracle messages, they were able to submit future-dated oracle reports that tricked the system into thinking trades were profitable.
The attacker siphoned at least $24 million USDC from the protocol, which they quickly swapped into ETH and laundered via Tornado Cash.
Bonzo Lend exploited for $9 million in oracle attack
The Hedera-based decentralized lending platform Bozno Lend was exploited for just over $9 million after an attacker took advantage of a flaw in the project's oracle system. The attacker was able to deposit tokens worth only a few dollars, then manipulate the project's oracle to reflect a dramatically higher price. They then borrowed $6.63 million in USDC and 34.5 million wrapped HBAR (~$2.4 million).
Bonzo has announced they will reimburse users affected by the exploit, with support from the Hedera Foundation.
Summer Finance exploited for $6 million, shuts down
Summer Finance, a defi platform that provides "institutional defi vault infrastructure", was exploited for $6 million in an apparent flash loan attack. The attacker used a flash loan to deposit $64.8 million and then withdraw $70.9 million, taking advantage of a price manipulation bug that allowed them to withdraw more than they deposited.
Shortly after the exploit, Summer Finance announced it had "no viable path forward other than to wind down operations". They added, "a meaningful portion of the team's own capital was held in the affected vaults, removing the runway we needed to rebuild."
- "Lazy Summer USDC Vault Exploit Post-Mortem: What Happened and What Comes Next", Summer Finance
- "Sunsetting Summer.fi and the Labs Company", Summer Finance
Dutch Knaken crypto platform collapses
The Dutch cryptocurrency platform Knaken (not to be confused with the American Kraken platform) abruptly went offline in early June, leaving roughly 30,000 customers unable to access their funds. The company was unable to secure a license under the EU's MiCA regulations, which it said forced them to shut down. Though they claim to be winding down the company in an orderly fashion, they have reportedly stopped paying customer withdrawals, and have asked customers to stop filing claims.
Dutch prosecutors have asked courts to declare the platform bankrupt, which would install a court-appointed trustee to oversee the process of extracting assets from the company to return to customers. The country's Fiscal Information and Investigation Service has also opened a criminal investigation into the platform.
Polymarket customers lose $2.97 million, company blames third-party vendor
Polymarket customers have lost around $2.97 million to an attacker who then swapped stolen Polymarket USD (pUSD) to ETH.
Polymarket, a crypto-based prediction markets platform, quickly made an announcement to claim that a third-party vendor had been compromised to allow an attacker to inject a malicious script into the website frontend. Polymarket has said it will refund affected customers.
Users of the SecondFi Cardano wallet lose $2.4 million in series of hacks
Users of the Cardano wallet SecondFi (formerly Yoroi) have lost a cumulative 16 million ADA (~$2.4 million) across three attacks targeting a vulnerability in the project's wallet generation code.
After the attacks commenced, SecondFi "rescued" another 129 million ADA (~$19.4 million) by moving the assets to a third party entity. They have announced that an external accounting firm will verify the funds and process user claims.
Taiko bridge exploited
The Taiko bridge, which allows assets to be transferred between the Ethereum mainnet and the Taiko Ethereum layer-2 chain, was exploited for at least $1.7 million before the network was halted, limiting losses. An attacker was able to forge withdrawal requests to appear as though they matched real deposits. Crypto security firm BlockSec said that the attacker may have gained access to a signing key that had been exposed on GitHub.
Highly active MEV bot known as jaredfromsubway.eth drained for $7.7 million
On blockchains like Ethereum, a strategy known as "MEV" (short for "maximal extractable value") allows intermediaries to profit from manipulating the structure of blocks added to the chain — often reordering or "sandwiching" transactions in ways that extract profits. Automated software known as MEV bots make a business out of this strategy, and one of the most active is a bot called jaredfromsubway.eth — likely so named after one-time Subway spokesman and convicted sex offender Jared Fogle because of its strategy of "sandwiching" transactions by placing trades on both sides, causing the original trader to pay more.
On June 20, an attacker used a series of contracts to cause the bot to grant token approvals that were later used to drain 4,427 ETH ($7.7 million). Some of the funds were then laundered through Tornado Cash.