CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NCVE-2026-61699
High (8.1). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/forgekeep/nebula-mesh 0.7.1.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-299, CWE-672
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-cm26-5974-52h8 | Go | github.com/forgekeep/nebula-mesh | <0.7.1 | 0.7.1 |
| GO-2026-5986 | Go | github.com/forgekeep/nebula-mesh | <0.7.1 | 0.7.1 |
References
- https://github.com/forgekeep/nebula-mesh/commit/0426e2f224a9b1e2029029bf923c93ed39d21cdb
- https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.1
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8