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CVE-2026-61699

8.1 · HIGH

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

Published Sep 4, 2026CWE-299EPSS 0.45%

Overview

CVE-2026-61699 is a high-severity vulnerability. It was published on September 4, 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-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.7.1, revocation is the only in-band mechanism that isolates a compromised/offboarded host from a Nebula mesh. Because the blocklist never reaches any peer's config.yml, a Blocked host retains full overlay reachability to every peer under its CA (and internal services on the mesh) for up to 30d (agent) / 365d (mobile). An attacker who exfiltrates host.key+host.crt can run stock slackhq/nebula directly, ignore the agent's 403/410 poll responses, and stay connected after the operator revokes the host. Operator-visible state (UI shows blocked, audit log records it) is misleading. This issue has been patched in version 0.7.1.

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/0426e2f224a9b1e2029029bf923c93ed39d21cdbGitHubgithub.com/forgekeep/nebula-mesh/releases/tag/v0.7.1GitHubgithub.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8GitHubgithub.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-61699?

CVE-2026-61699 is a high-severity vulnerability. It was published on September 4, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-61699?

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-2026-61699?

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-2026-61699?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-61699 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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