Incident Overview
On May 19, 2026, Echo Protocol’s Monad deployment was exploited due to a compromised admin key, leading to the unauthorized minting of 1,000 eBTC (valued at ~$77M at the time of the attack).
The incident was an operational security failure involving the compromise of a single-point private key associated with the protocol’s admin role. Lacking safeguards such as timelocks, minting supply caps, or rate limits, the compromised key allowed the attacker to mint unauthorized eBTC tokens directly on the Monad network. The attacker leveraged this unauthorized supply by depositing 45 eBTC into the Curvance lending protocol, using it to borrow roughly 11.3 WBTC.
This borrowed capital was then bridged to the Ethereum network, swapped for ETH, and sent to Tornado Cash to obscure the trail. Echo Protocol responded by pausing cross-chain functionality for its Monad deployment and suspending its Aptos bridge as a precautionary measure while conducting a comprehensive security audit of its permissioned functions and cross-chain controls.
Exploit Transaction: 0x2cc97307380f2d9c04d02633010b985117961917f6946001140939c3d45243415
Incident Report
Protocol Information
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 Echo Protocol, these are the critical security checks that could have prevented this incident (May 2026).
- Verify all logic paths related to Access Control 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.
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:
Sources & References
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