Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M

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

High 8.4

In plain English

A high-severity security flaw in zebra from ZcashFoundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 4.0)8.4High

Exploit odds (30 days)0.3%top 82.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
ZcashFoundation	zebra	< 4.3.0
ZcashFoundation	zebra-consensus	< 5.0.1

Weakness: CWE-347 · Vector: 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

References

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh x_refsource_CONFIRM
https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0 x_refsource_MISC
https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements x_refsource_MISC