How much was lost in the Rari Capital hack?

The Rari Capital hack resulted in $2.0M in losses on December 18, 2025.

What attack technique was used in the Rari Capital exploit?

The Rari Capital exploit utilized Uninitialized Proxy Hijack. 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.

Rari Capital Hack

TOTAL LOST $2.0M

Medium Dec 18, 2025 Uninitialized Proxy Hijack ethereum

Affected Chain ethereum Incident surface

Recovered - No recovery reported

All-Time Rank #629 By amount stolen

Auditors 1 Prior security audit

Incident Overview

Rari Capital aims to deliver the best yield to all users with various risk tolerances. Easy, sustainable and built for the future.

This is classified as a Access Control Attacks . Compare similar hacks →

Incident Report

Protocol / Project Rari Capital

Date of Incident December 18, 2025

Affected Chain(s) ethereum

Attack Technique Uninitialized Proxy Hijack

Classification Protocol Logic

Primary Source View Post-Mortem

Protocol Information

Protocol Type Yield Aggregator

Smart Contract Language Solidity

Official Website radiant.capital/

Protocol Twitter/X @RariCapital

Market Context at Time of Hack

Token Categories

DeFi Ethereum Ecosystem Binance Launchpool YZi Labs Portfolio Lending & Borrowing Arbitrum Ecosystem BNB Chain Ecosystem Base Ecosystem

Protocol Links

GitHub Discord

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 uninitialized proxy hijack and Solidity and EVM internals

Capital Required Seed capital to cover gas and initial position setup

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

Protocol Analysis Identification of the exploitable vulnerability in Rari Capital'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 Uninitialized Proxy Hijack audit checklist and test coverage

Audited by Audit Report 1 — still lost $2.0M. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to Rari Capital, these are the critical security checks that could have prevented this incident (December 2025).

Verify all logic paths related to Uninitialized Proxy Hijack are guarded by proper access controls and input validation - see the Access Control Attacks attack class for patterns
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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Security Audit History

Audit Report 1 Report

Related Attack Classes

The technique used in this hack maps to these vulnerability classes in our security curriculum:

See all Access Control Attacks examples →

Access Control Attacks

Sources & References

01
Source 1 https://x.com/zmtO21/status/2001585158106026270

Threat Assessment

Severity Level

MEDIUM

Attack Vector Uninitialized Proxy Hijack
Root Cause Protocol Logic
Year 2025

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