# Netmaker does not verify JWT signatures for host tokens

Advisory record · `GHSA-qpv2-rwc8-c993`

- **Identifiers:** `GHSA-qpv2-rwc8-c993` · `CVE-2026-38651` · `GO-2026-5588`
- **State:** Confirmed
- **Severity:** CVSS 8.2 High
- **Critical:** No
- **Weakness (CWE):** [CWE-347](https://cwe.mitre.org/data/definitions/347.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md)
- **Published:** 28 Apr 2026
- **Updated:** 25 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Apr 2026, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/gravitl/netmaker` (Go): affected `<1.5.0`; fixed in `1.5.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Netmaker versions before 1.5.0 do not verify JWT signatures for host tokens, so the host token check accepts forged tokens. An attacker who can reach the Netmaker server can forge a token with any host ID and retrieve that host's configuration, including password hashes, MQTT credentials, and WireGuard peer data. Upgrade to Netmaker 1.5.0 or later.

Written 7 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.2 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0035, the 29th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 28 Apr 2026, 16:16 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-38651)
- 31 Oct 2026, 15:06 UTC: First seen by agentprime
- 31 Oct 2026, 15:06 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-qpv2-rwc8-c993)

## Sources

- [GitHub Advisory Database: GHSA-qpv2-rwc8-c993](https://github.com/advisories/GHSA-qpv2-rwc8-c993)
- [OSV: GHSA-qpv2-rwc8-c993](https://osv.dev/vulnerability/GHSA-qpv2-rwc8-c993)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-38651>
- <https://github.com/gravitl/netmaker/commit/5309aa70d464ef565911369714d661a61481a79b>
- <https://github.com/gravitl/netmaker>
- <https://www.zyenra.com/advisories/netmaker-jwt-verification-bypass>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-qpv2-rwc8-c993>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-qpv2-rwc8-c993/>. Everything for agents: <https://agentprime.io/llms.txt>.