According to blockchain security firm PeckShield, March 2026 recorded approximately $52 million in crypto losses across 20 separate incidents, marking a 96% increase compared to February.
Yet the headline number only captures part of the risk.
Researchers point to a more structural issue emerging within decentralized finance: what they describe as “shadow contagion.”
When One Hack Becomes Many Problems
Unlike traditional financial systems, DeFi protocols are deeply interconnected.
Assets, liquidity pools, and lending systems often depend on each other across multiple platforms. When one protocol is compromised, the effects can cascade into others.
This creates a scenario where:
- A single exploit introduces bad debt into connected platforms
- Liquidity imbalances spread across protocols
- Users face losses even without direct exposure to the hacked system
This secondary impact — not always immediately visible — is what analysts describe as shadow contagion.
March’s Spike in Attacks
The March surge highlights both the frequency and diversity of attack vectors.
Key trends include:
- 96% increase in total losses month-on-month
- Over $52 million stolen across ~20 incidents
- More than 80% of losses linked to wallet breaches and phishing
The data suggests that while smart contract vulnerabilities remain a concern, human-targeted attacks are becoming equally significant.
Case Studies Behind the Numbers
Several high-profile incidents contributed to March’s losses:
- ResolvLabs: A compromised AWS key allowed attackers to mint large volumes of tokens, causing an 80% price collapse and spreading bad debt to platforms like MorphoBlue and Euler.
- Venus Protocol: Combined on-chain and off-chain attack methods resulted in losses exceeding $2 million.
- Sillytuna: A complex exploit involving both physical access and smart contract manipulation led to approximately $24 million in losses.
In another case, a large holder on Kraken reportedly lost $18 million due to social engineering tactics.
The Human Factor in Crypto Security
A notable shift in recent attacks is the growing role of human vulnerability.
Phishing campaigns, social engineering, and compromised credentials are increasingly being used alongside technical exploits.
This evolution reflects a broader reality:
- Code can be audited
- Humans remain unpredictable
As a result, even well-secured protocols can be exposed through user-level weaknesses.
DeFi’s Structural Weakness
The concept of shadow contagion highlights a core trade-off in DeFi design.
Interoperability — one of DeFi’s strengths — also creates systemic risk.
Protocols that share liquidity or collateral frameworks are inherently exposed to each other’s failures.
This raises questions about:
- Risk isolation mechanisms
- Collateral design standards
- Cross-protocol dependencies
Market Implications
While $52 million is relatively small compared to the total crypto market size, the pattern of interconnected risk is more concerning.
For investors and institutions, this suggests:
- Risk is not always confined to a single platform
- Portfolio exposure may be broader than expected
- Security assessments must consider ecosystem-level dependencies
A More Complex Threat Landscape
The rise in crypto hacks — combined with shadow contagion — signals a shift in how risk manifests in decentralized systems.
It is no longer just about preventing individual breaches, but about managing how failures propagate across networks.
What Comes Next
As DeFi matures, addressing systemic risk will become as important as improving individual protocol security.
Potential responses could include:
- Better isolation of collateral pools
- Real-time risk monitoring across protocols
- Stronger user security practices
For now, March’s spike serves as a warning: in a connected financial system, the true cost of a hack may extend far beyond the initial breach.
