CVE-2026-61699
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.
How to fix
- github.com/forgekeep/nebula-mesh0.7.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/forgekeep/nebula-meshGo | v < 0.7.1 | 0.7.1 |
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