Security advisory

{
  "id": "dad1bacff8ada694ca66397b52a05388829ab602b7a0b41d4d886675688b5a67",
  "url": "https://osv.dev/vulnerability/CVE-2021-3127",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3127",
    "summary": "NATS Server 2.x before 2.2.0 and JWT library before 2.0.1 have Incorrect Access Control because Import Token bindings are mishandled.",
    "evidence": "osv:CVE-2021-3127",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-3127",
      "aliases": [
        "BIT-nats-2021-3127",
        "CVE-2021-3127",
        "GHSA-62mh-w5cv-p88c",
        "GHSA-9r5x-fjv3-q6h4",
        "GHSA-j756-f273-xhp4",
        "GO-2022-0386"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nats-io/jwt",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "22bf1cf3386b569ad632f92d4e944c27ddecd875"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nats:jwt_library:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.0.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.2",
            "v2.0.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.1",
            "v1.0.1",
            "v1.0.0",
            "v0.3.2",
            "v0.3.0",
            "v0.2.16",
            "v0.2.14",
            "v0.2.12",
            "v0.2.10",
            "v0.2.8",
            "v0.2.6",
            "v0.2.4",
            "v0.2.2",
            "v0.2.0",
            "v0.0.8",
            "v0.0.6",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3127.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/nats-io/nats-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e12e56aef4089d8376e22b03cbc2e5b97321f049"
                },
                {
                  "fixed": "0e3c7230e4b7c85795592f74a62351f6fe22fcbd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "2.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.7",
            "v2.1.6",
            "v2.1.4",
            "v2.1.2",
            "v2.1.0",
            "v2.0.4",
            "v2.0.2",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3127.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:59.559324890Z",
      "provider": "osv",
      "references": [
        "https://advisories.nats.io/CVE/CVE-2021-3127.txt"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-3127",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 439347,
  "published_at": "2021-03-16T20:15:13.3+00:00"
}