May 2026 Crypto Security Losses Plunge 90% to $68.3 Million After April’s Surge

Key Takeaways

• May 2026 witnessed cryptocurrency security losses totaling $68.3 million, representing a 90% decrease compared to April’s $650 million
• This marks the third occasion in 2026 where monthly losses remained below the $100 million threshold
• A cross-chain bridge exploit targeting Verus Protocol resulted in the month’s most significant single incident at $11.5 million
• Flawed code implementations were responsible for approximately 66% of total damages, equating to roughly $45 million
• Cross-chain bridge infrastructure emerged as the primary target category, representing 42% of aggregate monthly losses

Blockchain security analysis firm CertiK reports that cryptocurrency platform vulnerabilities resulted in $68.3 million in losses throughout May, marking a dramatic 90% reduction from April’s staggering $650 million figure.

The security firm published their findings via X, highlighting that May represents the third consecutive month in 2026 where total security-related losses stayed beneath the $100 million mark.

April’s numbers had established one of the most severe monthly records for the industry. When the massive $1.5 billion Bybit breach from February 2025 is excluded, April’s figure represented the highest monthly loss total documented since March 2022. The Kelp DAO incident, which cost $291 million, drove much of April’s elevated losses.

May’s security landscape proved considerably calmer by comparison.

Phishing schemes accounted for $2.6 million of the monthly total. Security efforts resulted in approximately $9.4 million in stolen cryptocurrency being either recovered or voluntarily returned throughout the period.

Bridge Protocols and Programming Errors Dominated Vulnerability Landscape

The month’s most substantial security breach occurred on May 18 when Verus Protocol’s cross-chain bridge infrastructure was compromised, resulting in $11.5 million in stolen assets. THORChain experienced the second-largest incident, with attackers successfully extracting $10.1 million during a mid-May security breach.

Cross-chain bridge platforms represented the most frequently exploited infrastructure type, accumulating $28.6 million in losses—constituting 42% of May’s total damages.

Programming vulnerabilities emerged as the predominant root cause when measuring losses by dollar value. Approximately $45 million, representing roughly 66% of aggregate losses, stemmed from defective code implementations. Wallet breaches and private key compromises ranked second among attack vectors, accounting for $13.7 million in stolen funds.

According to DeFiLlama’s tracking data, May recorded 29 distinct security incidents. Private key compromises were implicated in seven of these separate attacks.

The month concluded with two final incidents reported on May 30, affecting both Alephium Bridge and Gravity Bridge platforms. Alephium sustained $815,000 in losses while Gravity Bridge lost $5.4 million—both breaches attributed to compromised private key security.

CertiK’s analysis additionally identified an emerging trend involving AI-enhanced malware deployment throughout May. Threat actors increasingly targeted cryptocurrency and artificial intelligence developers through compromised code repositories, manipulating AI-powered coding assistants to execute malicious operations.

Despite the improved figures relative to April, cybersecurity experts emphasize that cross-chain bridge infrastructure and private key management protocols continue to represent significant vulnerability areas requiring attention throughout the remainder of 2026.

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