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CVE-2026-25793

8.1 · HIGH

Nebula is a scalable overlay networking tool.

Published Feb 6, 2026CWE-347EPSS 0.18%

Overview

CVE-2026-25793 is a high-severity vulnerability. It was published on February 6, 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

Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

GitHubgithub.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21GitHubgithub.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962

How CyberStrike helps

Frequently asked questions

What is CVE-2026-25793?

CVE-2026-25793 is a high-severity vulnerability. It was published on February 6, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-25793?

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-2026-25793?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2026-25793?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-25793 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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