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NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection

Type: advisorySources: OSV

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-58213
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 02:24 UTC · Revision 1

Source evidence

NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection

core-osv · Original source

Published 8 Jul 2026, 19:52 UTC

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

osv:CVE-2026-58213
Complete source record
{
  "id": "6793aba8d8b9122977f0e5692a2b6df86a909726b6330ad10b54ca87a32624e9",
  "url": "https://osv.dev/vulnerability/CVE-2026-58213",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection",
    "summary": "NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.",
    "evidence": "osv:CVE-2026-58213",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-58213",
      "aliases": [
        "BIT-nats-2026-58213",
        "CVE-2026-58213",
        "GHSA-qrcv-3558-gj4f"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nats-io/nats-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5919e2bb31ba21cd3f3da4f148f5f5cd44e1faf7"
                },
                {
                  "introduced": "0cbd01caf8f29011c26273ff7662addd3830396a"
                },
                {
                  "fixed": "cb557cd5d3ee8b4a253071d9923730d7d5588f99"
                },
                {
                  "fixed": "366837cfc65ab9ccb4f98193c65e8daf238582d8"
                },
                {
                  "fixed": "64ebae40051ee497c481e10f316238faf0de1736"
                },
                {
                  "fixed": "f14856b9e57a36818f43851cb69b6e33670885c9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.12.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.14.0"
                      },
                      {
                        "fixed": "2.14.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "366837cfc65ab9ccb4f98193c65e8daf238582d8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "64ebae40051ee497c481e10f316238faf0de1736"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f14856b9e57a36818f43851cb69b6e33670885c9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5919e2bb31ba21cd3f3da4f148f5f5cd44e1faf7"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.12.9"
                  },
                  {
                    "range": [
                      {
                        "fixed": "cb557cd5d3ee8b4a253071d9923730d7d5588f99"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.14.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.14.1-RC.2",
            "v2.12.9-RC.2",
            "v2.14.1-RC.1",
            "v2.12.9-RC.1",
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            "v2.12.3",
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            "v2.12.3-RC.4",
            "v2.12.3-RC.3",
            "v2.12.3-RC.2",
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            "v2.12.2-RC.4",
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            "v2.12.1",
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            "v2.12.2-RC.1",
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            "v2.12.0-RC.2",
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            "v2.12.0-preview.2",
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            "v2.11.3",
            "v2.11.3-RC.2",
            "v2.11.3-RC.1",
            "v2.11.2",
            "v2.11.2-RC.3",
            "v2.11.2-RC.2",
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            "v2.7.0-rc2",
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58213.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.335392579Z",
      "provider": "osv",
      "references": [
        "https://github.com/nats-io/nats-server/releases/tag/v2.12.9",
        "https://github.com/nats-io/nats-server/releases/tag/v2.14.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58213.json",
        "https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-58213",
        "https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8",
        "https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736",
        "https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9",
        "https://github.com/nats-io/nats-server/pull/8163",
        "https://github.com/nats-io/nats-server/pull/8164"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-74"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58213.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-58213",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499616,
  "published_at": "2026-07-08T19:52:12.148+00:00"
}