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Medium

NATS JetStream has an authorization bypass through its Management API

Type: advisorySources: OSV

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-33222
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 18:32 UTC · Revision 1

Source evidence

NATS JetStream has an authorization bypass through its Management API

core-osv · Original source

Published 25 Mar 2026, 20:10 UTC

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.

osv:CVE-2026-33222
Complete source record
{
  "id": "11ace248ed51f56b9f56b236c4eb3447e484b9c1e9d1ee85e1e780fe63762733",
  "url": "https://osv.dev/vulnerability/CVE-2026-33222",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NATS JetStream has an authorization bypass through its Management API",
    "summary": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.",
    "evidence": "osv:CVE-2026-33222",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-33222",
      "aliases": [
        "BIT-nats-2026-33222",
        "CVE-2026-33222",
        "GHSA-9983-vrx2-fg9c",
        "GO-2026-4832"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nats-io/nats-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "bef17e1d9de6574fae0eabe1798db0d4529834e4"
                },
                {
                  "introduced": "fc6ec648d806652d282d2f0edb6cb9f22c895572"
                },
                {
                  "fixed": "0e0639058e0d2d8fce0cc34941f9897da152ab32"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.11.15"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.12.0"
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                      {
                        "fixed": "2.12.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
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            }
          ],
          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33222.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.600135475Z",
      "provider": "osv",
      "references": [
        "https://advisories.nats.io/CVE/secnote-2026-12.txt",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33222.json",
        "https://github.com/nats-io/nats-server/security/advisories/GHSA-9983-vrx2-fg9c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33222"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-285"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33222.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33222",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488520,
  "published_at": "2026-03-25T20:10:51.107+00:00"
}