CVE-2026-34202: Zfnd Zebra

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra's transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash). This is triggered by sending a specially crafted V5 transaction that passes initial deserialization but fails during transaction ID calculation. This issue has been patched in zebrad version 4.3.0 and zebra-chain version 6.0.1.

Affected products

• Zfnd Zebra: before 4.3.0 (fixed in 4.3.0)
• Zfnd Zebra-Chain: before 6.0.1 (fixed in 6.0.1)

Published 2026-03-31. Last modified 2026-07-24.