CVE-2026-40881
7.5 · HIGHOverview
CVE-2026-40881 is a high-severity vulnerability affecting zfnd zebra-network. It was published on April 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-network version 5.0.1, when deserializing addr or addrv2 messages, which contain vectors of addresses, Zebra would fully deserialize them up to a maximum length (over 233,000) that was derived from the 2 MiB message size limit. This is much larger than the actual limit of 1,000 messages from the specification. Zebra would eventually check that limit but, at that point, the memory for the larger vector was already allocated. An attacker could cause out-of-memory aborts in Zebra by sending multiple such messages over different connections. This vulnerability is fixed in zebrad version 4.3.0 and zebra-network version 5.0.1.
Remediation
Check the references section for vendor advisories and patches from zfnd. Update zebra-network 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-network | >= 0, < 5.0.1 | Affected |
| zfnd | zebrad | >= 0, < 4.3.1 | Affected |
Frequently Asked Questions
What is CVE-2026-40881?
CVE-2026-40881 is a high-severity vulnerability affecting zfnd zebra-network. It was published on April 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-40881?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-40881?
Check the references section for vendor advisories and patches from zfnd. Update zebra-network 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-2026-40881?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-40881 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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