CVE-2026-55513 Details
Description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.3.0 to before version 0.5.0, the nebula-mgmt Web UI host-creation path ignores both the server-wide enrollment_token_ttl security setting and per-network network_config.enrollment_token_ttl overrides. API host creation and token-regeneration paths use the configured TTL resolver, but POST /ui/hosts hardcodes now.Add(24 * time.Hour) for newly minted agent enrollment tokens. In deployments that intentionally reduce enrollment-token lifetime, any authenticated operator who can create a host through the Web UI can still mint a bearer enrollment token valid for about 24 hours. This issue has been patched in version 0.5.0.
A vulnerability exists in the Nebula Mesh Web UI host-creation process, specifically in versions 0.3.0 prior to 0.5.0. The issue arises because this process ignores the server-wide 'enrollment_token_ttl' setting and any per-network overrides, instead hardcoding a 24-hour expiration for enrollment tokens. This discrepancy allows authenticated operators to create hosts via the Web UI and receive tokens valid for 24 hours, even in networks configured for shorter token lifetimes. The vulnerability can be exploited by any authenticated operator with the ability to create hosts through the Web UI.
Users can update to Nebula Mesh version 0.5.0, where this vulnerability has been patched. In this version, the Web UI host-creation process correctly honors the configured enrollment token TTL settings.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 4, 2026CISA-ADP
Assessed Sep 8, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-g4x6-jcvr-9m3g | CISA-ADP | AdvisoryRemedyVendor |
| https://github.com/forgekeep/nebula-mesh/commit/514006029e09f1991122b86a80e7b25970bcfa98 | [email protected] | Source CodeVendor |
| https://github.com/forgekeep/nebula-mesh/releases/tag/v0.5.0 | [email protected] | Release NotesVendor |
| https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-g4x6-jcvr-9m3g | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-613 | Insufficient Session Expiration | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| forgekeep nebula-mesh | >= 0.3.0, < 0.5.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 8, 2026 | CVE Modified | CISA-ADP |
| Sep 4, 2026 | New CVE Received | [email protected] |