CVE-2026-40880
8.1 · HIGHOverview
CVE-2026-40880 is a high-severity vulnerability affecting zfnd zebra-consensus. It was published on April 21, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, 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 vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.
Remediation
Check the references section for vendor advisories and patches from zfnd. Update zebra-consensus to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| zfnd | zebra-consensus | >= 0, < 5.0.2 | Affected |
| zfnd | zebrad | >= 0, < 4.3.1 | Affected |
Frequently Asked Questions
What is CVE-2026-40880?
CVE-2026-40880 is a high-severity vulnerability affecting zfnd zebra-consensus. It was published on April 21, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2026-40880?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-40880?
Check the references section for vendor advisories and patches from zfnd. Update zebra-consensus to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-40880?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-40880 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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