---
id: CVE-2026-61699
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. 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 an…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-299
  - CWE-672
vendor: forgekeep
product: nebula-mesh
affected:
  - nebula-mesh < 0.7.1
patched:
  - github.com/forgekeep/nebula-mesh 0.7.1
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-2026-61699'
references:
  - url: >-
      https://github.com/forgekeep/nebula-mesh/commit/0426e2f224a9b1e2029029bf923c93ed39d21cdb
    label: security-advisories@github.com
  - url: 'https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8
    label: security-advisories@github.com
  - url: >-
      https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-cm26-5974-52h8'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - go
epss: 0.00249
epssPercentile: 0.16602
aliases:
  - GHSA-cm26-5974-52h8
ecosystem: go
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-08T12:58:55.248635Z'
ingestedAt: '2026-07-14T20:39:11.110Z'
---

## Overview

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.

## Remediation

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

## Package advisory (CVE-2026-61699)

Affected packages:

- `github.com/forgekeep/nebula-mesh < 0.7.1`

Patched in:

- `github.com/forgekeep/nebula-mesh 0.7.1`

Source: https://github.com/advisories/GHSA-cm26-5974-52h8