Mesh traffic redirection via injected agent YAML
Published Jul 23, 2026 · Updated Jul 23, 2026
YAML injection in juev nebula-mesh before 0.3.2 allows remote authenticated users to alter agent VPN behavior through advanced host fields. The config generator interpolates ListenHost and TunDevice directly into config.yml after the web handler applies only whitespace trimming. Any operator key can supply multiline YAML that a polling agent loads, enabling that host to become a lighthouse or relay and redirect mesh traffic.
Summary
What happened
YAML injection in juev nebula-mesh before 0.3.2 allows remote authenticated users to alter agent VPN behavior through advanced host fields. The config generator interpolates ListenHost and TunDevice directly into config.yml after the web handler applies only whitespace trimming. Any operator key can supply multiline YAML that a polling agent loads, enabling that host to become a lighthouse or relay and redirect mesh traffic.
The record
- CVE
- CVE-2026-47722
- Published
- Jul 23, 2026
- Updated
- Jul 23, 2026
- Vendor
- Forgekeep
- Product
- nebula-mesh
- Classifications
- CWE-94, T1090.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 23, 2026CVE publishedPublication date reported by the CVE source.
- Jul 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.3.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA multiline TunDevice YAML injection exampleproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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