TI-2026-26663 Aliases CVE-2026-34377 GHSA-3vmh-33xr-9cqh

Zebra has a Consensus Failure due to Improper Verification of V5 Transactions

LOW 36CWE-347Published 2026-03-31 · Updated 2026-03-31

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-347.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0026 17th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed zebra (ZcashFoundation): 4.3.0zebra-consensus (ZcashFoundation): 5.0.1+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ZcashFoundation	zebra	before 4.3.0	4.3.0	Patch available	CNA
ZcashFoundation	zebra-consensus	before 5.0.1	5.0.1	Patch available	CNA
—	zebrad (crates.io)	before 4.3.0	4.3.0	Patch available	GHSA-3vmh-33xr-9cqh
—	zebra-consensus (crates.io)	before 5.0.1	5.0.1	Patch available	GHSA-3vmh-33xr-9cqh

zebra VendorZcashFoundation Affected before 4.3.0 Fixed in 4.3.0 Patch available CNA
zebra-consensus VendorZcashFoundation Affected before 5.0.1 Fixed in 5.0.1 Patch available CNA
zebrad (crates.io) Vendor— Affected before 4.3.0 Fixed in 4.3.0 Patch available GHSA-3vmh-33xr-9cqh
zebra-consensus (crates.io) Vendor— Affected before 5.0.1 Fixed in 5.0.1 Patch available GHSA-3vmh-33xr-9cqh

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:zfnd:zebra::::::rust::*	before 4.3.0	Vulnerable	ZcashFoundation
cpe:2.3:a:zfnd:zebra-consensus::::::rust::*	before 5.0.1	Vulnerable	ZcashFoundation

cpe:2.3:a:zfnd:zebra:*:*:*:*:*:rust:*:* Versions before 4.3.0 Vulnerable ·ZcashFoundation
cpe:2.3:a:zfnd:zebra-consensus:*:*:*:*:*:rust:*:* Versions before 5.0.1 Vulnerable ·ZcashFoundation

Remediation

Fix · CNA zebra (ZcashFoundation) Fixed in 4.3.0
Fix · CNA zebra-consensus (ZcashFoundation) Fixed in 5.0.1
Fix · GHSA-3vmh-33xr-9cqh zebrad (crates.io) Fixed in 4.3.0 Advisory →
Fix · GHSA-3vmh-33xr-9cqh zebra-consensus (crates.io) Fixed in 5.0.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-34377
2026-10-03 Alias added: GHSA-3vmh-33xr-9cqh

References

Exploit 1

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh

Advisory 2

Other 3

TI-2026-26497 Zebra node crash — V5 transaction hash panic (P2P reachable) CVSS 4.0CRITICAL 9.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences