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Critical, CVSS 9.2

Netmaker does not verify JWT signatures for host tokens

CVE-2026-38651GHSA-qpv2-rwc8-c993

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/gravitl/netmaker 1.5.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
9.2 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N · score source
EPSS
  • CVE-2026-38651: 0.35% estimated exploitation activity in the next 30 days; percentile 29.06 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-qpv2-rwc8-c993

Agent brief

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# Patch Next advisory brief: CVE-2026-38651

Advisory: Netmaker does not verify JWT signatures for host tokens
IDs: CVE-2026-38651, GHSA-qpv2-rwc8-c993
Record: https://patchnext.com/advisories/cve-2026-38651 (revision 1, source checked 26 Oct 2026, 15:19 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/gravitl/netmaker 1.5.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/gravitl/netmaker: affected < 1.5.0; fixed in 1.5.0

## Suggested inspection (read-only)
- Go github.com/gravitl/netmaker: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/gravitl/netmaker.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-qpv2-rwc8-c993 (GitHub-reviewed advisory GHSA-qpv2-rwc8-c993 lists affected ranges: Go github.com/gravitl/netmaker >=0 <1.5.0)

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