CVE-2026-34377
Zebra has a Consensus Failure due to Improper Verification of V5 Transactions
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.
INFO
Published Date :
March 31, 2026, 3:16 p.m.
Last Modified :
April 6, 2026, 4:57 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update zebrad to version 4.3.0 or later.
- Update zebra-consensus to version 5.0.1 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34377.
| URL | Resource |
|---|---|
| https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0 | Release Notes |
| https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh | Exploit Vendor Advisory |
| https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34377 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34377
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34377 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34377 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 06, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:zfnd:zebra-consensus:*:*:*:*:*:rust:*:* versions up to (excluding) 5.0.1 *cpe:2.3:a:zfnd:zebra:*:*:*:*:*:rust:*:* versions up to (excluding) 4.3.0 Added Reference Type GitHub, Inc.: https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements Types: Vendor Advisory -
New CVE Received by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-347 Added Reference https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0 Added Reference https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh Added Reference https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements