CVE-2026-47724
A critical flaw in nebula-mesh, a self-hosted control plane for Slack Nebula VPN, allows non‑admin operators to use their API key to access all tenants. The issue exists in versions before 0.3.4 and is fixed in that release.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
nebula-mesh (self‑hosted control plane for Slack Nebula mesh VPN) versions prior to 0.3.4.
Real-world impact
An attacker with a non‑admin operator API key can read, modify, or delete data across all tenants, effectively escalating privileges and compromising the entire VPN network.
Why this severity
The CVSS score of 9.9 reflects that the vulnerability is reachable over the network, requires only low effort, needs minimal privileges, and has no user interaction. It also changes the scope of the system and fully compromises confidentiality, integrity, and availability.
What to do about it
- 01Upgrade nebula-mesh to version 0.3.4 or later.
NVD-referenced vendor advisory
Timeline
- Jul 23, 2026 · 8d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 23, 2026 · 8d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
- Jul 30, 2026 · 2d agoAdvisory updatedThe NVD record was last revised.