forgekeep nebula-mesh up to 0.3.1 Config Generator/Web advanced.go ListenHost/TunDevice code injection

Summaryinfo

A vulnerability was found in forgekeep nebula-mesh up to 0.3.1. It has been rated as very critical. The affected element is an unknown function of the file internal/configgen/generator.go/internal/web/advanced.go of the component Config Generator/Web Handler. This manipulation of the argument ListenHost/TunDevice causes code injection. This vulnerability is registered as CVE-2026-47722. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in forgekeep nebula-mesh up to 0.3.1. It has been declared as very critical. Affected by this vulnerability is an unknown function of the file internal/configgen/generator.go/internal/web/advanced.go of the component Config Generator/Web Handler. The manipulation of the argument ListenHost/TunDevice with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-47722 since 05/19/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/23/2026). The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 0.3.2 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• forgekeep

Name

• nebula-mesh

Version

• 0.3.0
• 0.3.1

Website

• Product: https://github.com/forgekeep/nebula-mesh/

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion