A $280 million lesson! A 2026 DeFi Security Pitfall Avoidance Guide

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Author: Ling Shi Technology

Preface

With the rapid development of DeFi, “decentralized finance” has evolved from a niche gadget for hardcore tech enthusiasts into fertile ground for ordinary people chasing high returns. Staking mining, liquidity mining, lending to earn interest… all kinds of strategies keep emerging. Annualized yields easily reach dozens or even over a hundred percentage points, making it hard not to feel tempted.

However, behind the returns lies risk. On April 1, 2026, Drift Protocol, a leading perpetual contract DEX in the Solana ecosystem, suffered a major attack, with losses of approximately $220 million to $285 million, becoming the largest DeFi hacking incident to date in 2026.

This incident rings the alarm once again: in the world of DeFi, there’s no customer support to help you recover funds, and no bank to stand behind you. With every interaction, you are solely responsible for your assets.

To help everyone avoid risks, the security team at Ling Shi Technology, combining real-world attack cases, has summarized 5 key security checks that must be completed before participating in DeFi—helping you identify risks before you operate and keep your assets safe.

How are DeFi risks happening?

Many people think that hacking attacks are far from them, but the reality is that most asset losses happen during users’ “normal operations.”

You didn’t do anything particularly wrong—you just overlooked something at some step. Below are the four most common risk paths:

1. Improper authorization → assets get transferred out

You clicked “Approve,” giving the smart contract unlimited permission to use your wallet. Once the contract turns malicious or gets hacked, your assets are emptied in an instant.

2. Visiting phishing websites → your wallet gets taken over

You searched for a project, opened the top advertisement link, and the page looks exactly like the official website. After connecting your wallet, your seed phrase or signatures have been obtained by the hacker.

3. Smart contract vulnerabilities → funds are “stolen legally”

The project itself is legitimate, but the code has vulnerabilities. The hacker exploits the漏洞 to bypass restrictions and extract funds from the protocol treasury—your assets are also among them.

4. Project Rug Pull → liquidity gets drained

The team from the start is a scammer. Once your funds are deposited and become large enough, they directly withdraw the coins from the liquidity pool, and the token value instantly goes to zero.

Once you understand where the risks come from, look at the 5 checks below, and you’ll know exactly where each “knife” lands.

✅ Check 1: Smart contract security — open source + audits are the baseline

Many people have their assets stolen not because the hackers are more technically sophisticated, but because the project’s smart contract is “toxic” in the first place.

⚠️What you need to do is not to “trust the project,” but to:

• Whether the code is open source: Use a block explorer (such as Etherscan, Solscan) to check whether the contract has been “Verified.” If a contract isn’t open source, it’s like keeping the rules in a black box—don’t touch it.

• Whether it has been audited: Go to the official websites of CertiK, PeckShield, SlowMist, etc., search the project name, and confirm there is a real audit report and that any high-severity vulnerabilities have been fixed.

• Whether there are historical vulnerabilities: Use third-party platforms such as DeFi Safety, RugDoc, etc., enter the contract address, and review the security score and past risk records.

🚩 High-risk signals:

• The contract is not open source

• No third-party audit report, or only “self-audited”

• The contract is deployed only a few days ago and goes live

🔗 Quick tip: On the “Contract” page of a block explorer, if you see “Source Code Not Verified,” just close the page.

✅ Check 2: Authorization management — don’t let the contract be able to “withdraw indefinitely”

Many people don’t lose assets because they were hacked—they lost them because they authorized a contract they shouldn’t. When you click “Approve,” it’s like handing the contract a key. If that key is a “master key,” the contract can open the door to all assets of the same type in your wallet at any time.

⚠️Key things to check

• Whether it requests “infinite authorization”: In the authorization pop-up, if the amount shows unlimited or the uint256 maximum value, it means the contract can transfer your assets an unlimited number of times, without any limit tied to how much you deposited.

• Whether it’s a strange contract address: Carefully verify the contract address that you’re authorizing. Make sure it matches the official address published by the project. Miss a single letter and it could be phishing.

👉 Recommendations

• Prefer “least privilege authorization”: When authorizing, manually change the allowance to the exact amount needed for this transaction. For example, if you only deposit 0.1 ETH, set the allowance to 0.1 ETH. Rabby and customized MetaMask wallets already support this.

• Regularly clean up approvals: Visit revoke.cash or etherscan.io/tokenapprovalchecker to see which contracts you’ve authorized. If you find something suspicious or don’t recognize it, revoke it with one click.

Sample interface on the revoke.cash official website. The “Unlimited” approvals shown in the circle should be revoked promptly.

✅ Check 3: Official entry points — phishing sites are more terrifying than hackers

According to statistics, more than 60% of DeFi asset losses come from phishing attacks, not from smart contract vulnerabilities.

⚠ Common tactics

• Impersonated official websites: The domain is off by just one letter (e.g., uniswap.com vs uniswao.com), and the page is fully copied.

• Fake airdrop pages: Promoted on Twitter or Discord with “free XX airdrop.” After connecting your wallet, the authorization transfers the assets out.

• Search engine ad poisoning: If you search “Uniswap,” the first ad might be a phishing website; the domain is extremely similar to the official one.

👉 Recommendations

• Enter only through official channels: Get the official website link from the project’s official Twitter, Discord announcements, and GitHub repository—don’t trust search engine ads.

• Bookmark frequently used DeFi websites: Add the official site of the protocols you use often to your browser bookmarks, and always enter via bookmarks.

• Don’t click unfamiliar links: Any links sent by anyone (including group friends or via private messages) should be treated with suspicion first.

🔗 Quick tip: Install phishing-detection versions of wallet plugins such as Rabby or MetaMask; they automatically block known phishing domains.

✅ Check 4: Abnormal returns — high yields hide high risks

According to statistics, more than 60% of DeFi asset losses come from phishing attacks, not from smart contract vulnerabilities.

If a project:

• Offers annualized returns far above the market average (for example, stablecoin APY over 20%)

• Emphasizes “risk-free arbitrage” or “guaranteed profit”

• Encourages “join early, invest quickly,” manufacturing FOMO (fear of missing out)

Then you can basically judge: risk ≈ promised returns × 10.

Many Rug Pull projects use “high returns” to attract liquidity. Their early returns may come from new users’ principal (a Ponzi-like model). Once inflows slow down, the team withdraws the pool and runs.

👉 Recommendations

• Compare with market benchmarks: For mainstream DeFi protocols (such as Aave, Compound), stablecoin APY is typically between 2% and 8%. If it’s more than 3 times higher than that range, be highly alert.

• Check the project’s lifetime: Projects that launch and open extremely high yields within just a few days are most likely “honeypots.”

• Search the project name + scam / rug: Use Google or Twitter to see whether users have reported it.

🚩 One-sentence principle: If it sounds too good to be true, it probably is.

✅ Check 5: Asset isolation — don’t put all your eggs in one wallet

Many users only have one main wallet, and all assets, all DeFi interactions, and all NFT mints are done in this wallet. Once this wallet is phished, authorized to a malicious contract, or your private key is leaked, all assets will be wiped out at once.

It’s recommended to set up a “three-wallet” system:

⚠️The essence is: control single-point risks to avoid “total loss in one go”

• For new projects or protocols that haven’t been verified, use a temporary wallet and deposit only the minimum threshold amount to test.

• Regularly clean up authorizations in your main wallet (once a week or once a month).

• Keep core assets in a cold wallet—never sign, never authorize, and never connect to any website.

More terrifying than hackers is “insiders”

Besides external attacks, there is another risk that’s often overlooked—insiders doing harm. They might be developers, operations staff, or even “customer support.”

⚠️Where do insiders come from?

• Backdoors planted by developers or auditors: Developers and auditors have submission permissions and system access. If any of them turns malicious, they can plant backdoors, steal sensitive keys, and disguise it as normal development activity, making it difficult to be detected.

• Administrators with core privileges who steal for themselves: If the person holding the admin private key has bad intentions, all users’ assets could be cleared in one sweep.

• Employees using job privileges to steal user information: In February 2026, a 34-year-old network engineer at a crypto investment company in Hong Kong used system access permissions to log into the company database without authorization and stole approximately 2.67 million USDT from about 20 customers (about HKD 20.87 million). The employee had worked at the company for up to 4 years, responsible for APP development and maintenance. It was precisely this “legitimate privilege” that enabled him to carry out the theft.

👉 How to prevent it?

• Individual users: Choose protocols with “time locks” (major actions are delayed by 24–48 hours before execution), and check whether the project’s multi-signature managers are publicly transparent.

• Project teams: Core permissions must be managed with a multi-signature wallet, set time-lock buffers, and regularly audit internal access logs.

Why do you still get targeted even when you’re “being careful”?

Because the attack has shifted from “technical vulnerabilities” to “human vulnerabilities.”

⚠️Common psychological misconceptions

• “This project is really popular, so it must be fine”

• “Everyone is using it, so nothing will happen”

• “I’m only doing this once, so it won’t be that coincidental”

👉 The reality is: the attacker only needs you to make one mistake

⚠️New trend: AI + phishing attacks

• Highly impersonated official website pages

• Automatically generated customer support conversations

• Precision targeting of users

👉 It’s getting harder for users to tell what’s real

A simplest set of DeFi security principles

If you can’t remember all the checks, remember these 3 👇

• Don’t authorize randomly

• Don’t click unfamiliar links

• Don’t go all-in on a single project

🔑 One-sentence summary: DeFi risk isn’t in the code you can’t understand—it’s in every operation you ignore.

Conclusion

DeFi brings openness and freedom, but also introduces brand-new security challenges. From the Drift Protocol incident to everyday phishing attacks, risk has long shifted from “extreme events” to “routine threats.”

In the face of a complex on-chain environment, what truly protects your assets isn’t luck—it’s awareness and habits.

If you have doubts about the DeFi projects you’re currently using, it’s recommended that you conduct a security check as soon as possible.

👉 In the on-chain world, security isn’t an add-on—it’s the entry requirement.