Zcash Foundation Releases Urgent Patch for Critical Security Flaws in Zebra Node Software
Severity: High (Score: 72.0)
Sources: Mexc, Chaincatcher
Summary
On May 2, 2026, the Zcash Foundation announced the release of Zebra version 4.4.0, addressing multiple critical security vulnerabilities in its Rust-based Zcash node implementation. The update fixes five significant flaws, including a denial-of-service vulnerability that could permanently halt block discovery and issues that could lead to consensus divergences between Zebra and legacy zcashd clients. The most severe vulnerability allowed attackers to exploit a combination of weaknesses to disrupt node operations without detection. April 2026 was reported as the worst month for crypto hacks, with losses totaling approximately $651 million across the industry, according to CertiK. The Foundation strongly recommends that all node operators upgrade immediately to avoid potential chain forks and resource consumption issues. Security researcher Sangsoo-osec identified three of the five vulnerabilities. The update is critical as it addresses consensus-critical issues that could lead to significant operational disruptions. Key Points: • Zcash Foundation released Zebra 4.4.0 on May 2, 2026, to fix critical vulnerabilities. • Five vulnerabilities were patched, including a denial-of-service issue and consensus divergences. • April 2026 saw $651 million in crypto losses, marking it as the worst month for hacks.
Key Entities
- Lazarus Group (apt_group)
- DDoS (attack_type)
- Bybit (company)
- Drift Protocol (company)
- KelpDAO (company)
- LayerZero (platform)
- Zcashd (platform)
- Zebra (platform)
- North Korea (country)