Incident Overview
On June 26, 2025, Resupply Protocol suffered a $9.5 million exploit affecting only the wstUSR market. The team has identified and paused the compromised contract while confirming that the rest of the protocol remains fully operational.
The attacker exploited a vulnerability in the wstUSR market contract of Resupply, leading to a suspicious transaction resulting in the unauthorized withdrawal of approximately $9.5 million. The exploit was detected by BlockSec’s Phalcon system and involved the manipulation of protocol logic specific to the wstUSR collateral handling, triggering abnormal outflows before the contract was paused.
Incident Report
Protocol Information
Market Context at Time of Hack
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.
What Auditors Should Check
If you're auditing a protocol with similar architecture to Resupply, these are the critical security checks that could have prevented this incident (June 2025).
- Verify all logic paths related to Price Oracle Manipulation / Other are guarded by proper access controls and input validation - see the Oracle Manipulation & Price Manipulation attack class for patterns
- Audit oracle price feeds for manipulation risks - ensure time-weighted average prices (TWAPs) or multi-source aggregators are used, not spot prices
- 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.
Free TrialSecurity Audit History
- Audit Report 1 Report
Related Attack Classes
The technique used in this hack maps to these vulnerability classes in our security curriculum:
Proof-of-Concept Exploits
On-Chain Evidence & References
- Twitter/X Alert https://x.com/ResupplyFi/status/1938927974272938420
Sources & References
Learn to Prevent the Next Resupply
The Resupply hack is one of many attacks that skilled auditors are trained to detect before deployment. Master real exploit patterns and defense techniques with hands-on Web3 security training.