CVE-2026-34377: Zfnd Zebra

High severity, CVSS 8.1. EPSS: 0.4% 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-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.

Affected products

• Zfnd Zebra: before 4.3.0 (fixed in 4.3.0)
• Zfnd Zebra-Consensus: before 5.0.1 (fixed in 5.0.1)

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