---
id: CVE-2026-55513
title: nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN
summary: >-
  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-networ…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-613
vendor: forgekeep
product: nebula-mesh
affected:
  - 'nebula-mesh >= 0.3.0, < 0.5.0'
patched:
  - github.com/forgekeep/nebula-mesh 0.5.0
published: '2026-09-04'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:05:26.920'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55513'
references:
  - url: >-
      https://github.com/forgekeep/nebula-mesh/commit/514006029e09f1991122b86a80e7b25970bcfa98
    label: security-advisories@github.com
  - url: 'https://github.com/forgekeep/nebula-mesh/releases/tag/v0.5.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-g4x6-jcvr-9m3g
    label: security-advisories@github.com
  - url: >-
      https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-g4x6-jcvr-9m3g
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-g4x6-jcvr-9m3g'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - go
epss: 0.0032
epssPercentile: 0.2224
aliases:
  - GHSA-g4x6-jcvr-9m3g
ecosystem: go
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T17:31:11.061279Z'
ingestedAt: '2026-07-14T20:39:11.150Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55513)

Affected packages:

- `github.com/forgekeep/nebula-mesh >= 0.3.0, < 0.5.0`

Patched in:

- `github.com/forgekeep/nebula-mesh 0.5.0`

Source: https://github.com/advisories/GHSA-g4x6-jcvr-9m3g