Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zfnd | Zebra | < 4.3.0 |
| Zfnd | Zebra-Consensus | < 5.0.1 |
Related Weaknesses (CWE)
References
- https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0Release Notes
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqhExploitVendor Advisory
- https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performVendor Advisory
FAQ
What is CVE-2026-34377?
CVE-2026-34377 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 t...
How severe is CVE-2026-34377?
CVE-2026-34377 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34377?
Check the references section above for vendor advisories and patch information. Affected products include: Zfnd Zebra, Zfnd Zebra-Consensus.