GHSA-QPV2-RWC8-C993

Vulnerability from github – Published: 2026-04-28 18:30 – Updated: 2026-05-05 14:45
VLAI
Summary
Netmaker does not verify JWT signatures for host tokens
Details

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.

Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
9.2 (Critical)
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
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gravitl/netmaker"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-38651"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T14:45:55Z",
    "nvd_published_at": "2026-04-28T16:16:13Z",
    "severity": "CRITICAL"
  },
  "details": "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\u0027s full configuration including bcrypt-hashed passwords, MQTT credentials, and WireGuard peer data. The issue was patched in v1.5.0.",
  "id": "GHSA-qpv2-rwc8-c993",
  "modified": "2026-05-05T14:45:55Z",
  "published": "2026-04-28T18:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-38651"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gravitl/netmaker/commit/5309aa70d464ef565911369714d661a61481a79b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gravitl/netmaker"
    },
    {
      "type": "WEB",
      "url": "https://www.zyenra.com/advisories/netmaker-jwt-verification-bypass"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Netmaker does not verify JWT signatures for host tokens"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.