High severity · published Jul 23, 2026
CVE-2026-47722
nebula-mesh: Host advanced overrides allow YAML injection into agent config.yml
8.7
CVSS
0.5%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
nebula-mesh · juev
< 0.3.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47722
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47722
github.com
https://github.com/forgekeep/nebula-mesh/commit/c1506f7344ab375a145a7449b193af3f19bb41ef
github.com
https://github.com/forgekeep/nebula-mesh/issues/126
github.com
https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7hp6-g3pq-3pc3
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