High 8.4Published Mar 31, 2026

CVE-2026-34377Zebra has a Consensus Failure due to Improper Verification of V5 Transactions

Updated under an hour ago (Oct 27, 2026, 3:10 AM ET)

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It affects ZcashFoundation zebra and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ZcashFoundation zebra

Exploited in the last 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.

CVSS: 8.4 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H
Weakness (CWE): CWE-347
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ZcashFoundation zebra zcashfoundation:zebra (from the name)	before 4.3.0	CNA record
ZcashFoundation zebra-consensus zcashfoundation:zebra_consensus (from the name)	before 5.0.1	CNA record
zfnd zebra zfnd:zebra	before 4.3.0	NVD
zfnd zebra-consensus zfnd:zebra-consensus	before 5.0.1	NVD

References

References

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh	x-refsource-confirm, exploit, vendor-advisory
https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0	x-refsource-misc, release-notes
https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements	x-refsource-misc, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.