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CVE-2026-63464

7.7 · HIGH

nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN.

Published Sep 4, 2026CWE-862EPSS 0.46%

Overview

CVE-2026-63464 is a high-severity vulnerability. It was published on September 4, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webhook subscription (POST/PATCH /api/v1/webhook-subscriptions). No admin check exists on this field. At delivery time, allow_private switches the dispatcher to an unguarded HTTP client, bypassing the private/loopback/link-local SSRF guard — letting a low-privilege operator make the server request internal addresses. This issue has been patched in version 0.7.2.

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/forgekeep/nebula-mesh/commit/f3c54530e388dd21763e548923426e60a8e93ff0GitHubgithub.com/forgekeep/nebula-mesh/releases/tag/v0.7.2GitHubgithub.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76GitHubgithub.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63464?

CVE-2026-63464 is a high-severity vulnerability. It was published on September 4, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-63464?

This vulnerability has a CVSS 3.1 base score of 7.7, 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-2026-63464?

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-2026-63464?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63464 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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