Vulnerability · Published Jul 23, 2026 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity code injection in nebula-mesh from juev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.5%top 59.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/juev/nebula-mesh	0.3.2	GHSA-7hp6-g3pq-3pc3
Go	github.com/juev/nebula-mesh	0.3.2	GO-2026-5223

Affected products (as reported)

Vendor	Product	Versions
juev	nebula-mesh	< 0.3.2

Weakness: CWE-94 · 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

References

https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7hp6-g3pq-3pc3 x_refsource_CONFIRM
https://github.com/forgekeep/nebula-mesh/issues/126 x_refsource_MISC
https://github.com/forgekeep/nebula-mesh/commit/c1506f7344ab375a145a7449b193af3f19bb41ef x_refsource_MISC