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HIGH severity

CVE-2026-38651 — netmaker

HIGHFix: gravitl/netmaker@5309aa7

CVE-2026-38651 is a high-severity (CVSS 8.2) CWE-347 vulnerability in github.com/gravitl/netmaker. A fix is available for github.com/gravitl/netmaker — see the affected versions and patch details below.

Netmaker does not verify JWT signatures for host tokens

Also known asGHSA-qpv2-rwc8-c993GO-2026-5588
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk+0.06%
Lower risk than most CVEs29th percentile — riskier than 29% of all scored CVEsHighest risk
0.00%0.31%0.63%0.94%0.0%0.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹github.com/gravitl/netmaker

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Netmaker by Gravitl is an open-source WireGuard-based networking platform for creating and managing virtual overlay networks. The VerifyHostToken function in logic/jwts.go does not validate the JWT signature when verifying host tokens. After calling jwt.ParseWithClaims, the function only checks whether the returned token object is non-nil. It does not check token.Valid or the returned error. An attacker can forge a JWT signed with any key, set the claims to any host ID, and pull that host's full configuration including bcrypt-hashed passwords, MQTT credentials, and WireGuard peer data. The issue was patched in v1.5.0.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/gravitl/netmakerall versions1.5.0go get github.com/gravitl/netmaker@v1.5.0

Affected Products

1 product · 1 configurations
Application
netmakernetmaker
< 1.5.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/gravitl/netmaker, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/gravitl/netmaker to 1.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-38651 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Netmaker by Gravitl is an open-source WireGuard-based networking platform for creating and managing virtual overlay networks. The `VerifyHostToken` function in `logic/jwts.go` does not validate the JWT signature when verifying host tokens. After calling `jwt.ParseWithClaims`, the function only checks whether the returned token object is non-nil. It does not check `token.Valid` or the returned error. An attacker can forge a JWT signed with any key, set the claims to any host ID, and pull that host's full configuration including bcrypt-hashed passwords, MQTT credentials, and WireGuard peer data.
O3 Security · Impact-Aware SCA

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CVE-2026-38651: netmaker — Fixed in 1.5.0