nebula-mesh: Host advanced overrides allow YAML injection into agent config.yml
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-94.
Summary
nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.2, `internal/configgen/generator.go:86,108,119` interpolates the operator-supplied `ListenHost` and `TunDevice` fields raw into a `text/template` that produces the agent's `config.yml`. `internal/web/advanced.go:20-35` accepts both with only `strings.TrimSpace` — no character or shape validation. Version 0.3.2 fixes the issue.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| juev | nebula-mesh | before 0.3.2 | 0.3.2 | Patch available | CNA |
| — | github.com/juev/nebula-mesh (Go) | before 0.3.2 | 0.3.2 | Patch available | GHSA-7hp6-g3pq-3pc3 |
- nebula-mesh Vendorjuev Affected before 0.3.2 Fixed in 0.3.2 Patch available CNA
- github.com/juev/nebula-mesh (Go) Vendor— Affected before 0.3.2 Fixed in 0.3.2 Patch available GHSA-7hp6-g3pq-3pc3
Remediation
- Fix · CNA nebula-mesh (juev) Fixed in 0.3.2
- Fix · GHSA-7hp6-g3pq-3pc3 github.com/juev/nebula-mesh (Go) Fixed in 0.3.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-47722
- 2026-10-03 Alias added: GHSA-7hp6-g3pq-3pc3
References
Other 5
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7hp6-g3pq-3pc3
- https://github.com/forgekeep/nebula-mesh/issues/126
- https://github.com/forgekeep/nebula-mesh/commit/c1506f7344ab375a145a7449b193af3f19bb41ef
- https://github.com/juev/nebula-mesh/security/advisories/GHSA-7hp6-g3pq-3pc3
- https://github.com/juev/nebula-mesh
More juev vulnerabilities
- TI-2026-35226 nebula-mesh: Web UI lacks CSRF tokens on /ui/* mutating endpoints CVSS 4.0MEDIUM 6.9
- TI-2026-35227 nebula-mesh: GET /api/v1/audit-log discloses all entries to any operator CVSS 4.0HIGH 7.1
- TI-2026-35499 nebula-mesh: Session and OIDC state cookies lack the Secure attribute CVSS 4.0MEDIUM 4.6
- TI-2026-35225 nebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalation CVSS 3.1CRITICAL 9.9
- TI-2026-36454 Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete) CVSS 3.1HIGH 8.8
- TI-2026-35468 nebula-mesh: Decrypted CA private key persists in heap after signing CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-47722 · CVE Program
- CVE-2026-47722 · NVD
- FIRST EPSS
- GHSA-7hp6-g3pq-3pc3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences