CVE-2026-61699
highnebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN.
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/forgekeep/nebula-mesh/commit/0426e2f224a9b1e2029029bf923c93ed39d21cdb security-advisories@github.com
- https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.1 security-advisories@github.com
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8 security-advisories@github.com
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8 134c704f-9b21-4f2e-91b3-4a467353bcc0