How much was lost in the Veil Cash hack?

The Veil Cash hack resulted in $5K in losses on February 21, 2026.

What attack technique was used in the Veil Cash exploit?

The Veil Cash exploit utilized misconfigured Groth16 verifier. Understanding this attack vector is critical for smart contract auditors and developers building secure DeFi protocols.

How can developers prevent similar smart contract attacks?

Preventing smart contract hacks requires a combination of secure coding practices, thorough security audits, and understanding common attack vectors like reentrancy, oracle manipulation, and access control flaws. Smart Contract Hacking (SCH) provides hands-on training to help developers and auditors identify and prevent vulnerabilities before deployment.

Veil Cash Hack

TOTAL LOST $5K

Low Feb 21, 2026 misconfigured Groth16 verifier base

Affected Chain base Incident surface

Recovered - No recovery reported

All-Time Rank #1976 By amount stolen

Protocol Type Privacy Target category

Incident Overview

Veil Cash is a privacy application leveraging zk-SNARKs on Base L2, enabling verified depositors to achieve privacy and anonymity within a pool of trusted users.

Incident Report

Protocol / Project Veil Cash

Date of Incident February 21, 2026

Affected Chain(s) base

Attack Technique misconfigured Groth16 verifier

Classification Protocol Logic

Primary Source View Post-Mortem

Protocol Information

Protocol Type Privacy

Smart Contract Language Solidity

Official Website www.veil.cash/

Protocol Twitter/X @Veildotcash

What the Attacker Needed to Succeed

Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.

Technical Knowledge Deep understanding of misconfigured groth16 verifier and Solidity and EVM internals

Capital Required Seed capital to cover gas and initial position setup

On-Chain Access Ability to interact with base smart contracts and deploy a custom exploit contract

Protocol Analysis Identification of the exploitable vulnerability in Veil Cash's contract logic - root cause: protocol logic

Execution Speed Precise transaction ordering and timing to exploit the vulnerability within a single atomic block

Obfuscation Plan A strategy to launder and move stolen funds - typically through mixers, cross-chain bridges, or decentralized DEX swaps to resist tracing

What Auditors Should Check

Could this have been caught in audit? Likely — with a thorough misconfigured Groth16 verifier audit checklist and test coverage

If you're auditing a protocol with similar architecture to Veil Cash, these are the critical security checks that could have prevented this incident (February 2026).

Verify all logic paths related to misconfigured Groth16 verifier are guarded by proper access controls and input validation
Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs

Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.

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Sources & References

01
Source 1 https://x.com/Veildotcash/status/2025293773891404225

Threat Assessment

Severity Level

LOW

Attack Vector misconfigured Groth16 verifier
Root Cause Protocol Logic
Year 2026

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