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DEBIAN-CVE-2026-33246

Type: advisorySource: OSV1 source record

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-33246

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-33246

nats-server

Source reference: /affected/0/package/name

Affected versions
2.10.1-1

Source reference: /affected/0/versions

2.10.16-1

Source reference: /affected/0/versions

2.10.18-1

Source reference: /affected/0/versions

2.10.24-1

Source reference: /affected/0/versions

2.10.27-1

Source reference: /affected/0/versions

2.10.3-1

Source reference: /affected/0/versions

2.10.4-1

Source reference: /affected/0/versions

2.10.7-1

Source reference: /affected/0/versions

2.12.4-1

Source reference: /affected/0/versions

2.12.6-1

Source reference: /affected/0/versions

2.14.1-1

Source reference: /affected/0/versions

2.14.3-1

Source reference: /affected/0/versions

2.14.6-1

Source reference: /affected/0/versions

2.9.10-1

Source reference: /affected/0/versions

2.9.19-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

nats-server

Source reference: /affected/1/package/name

Affected versions
2.10.27-1

Source reference: /affected/1/versions

2.12.4-1

Source reference: /affected/1/versions

2.12.6-1

Source reference: /affected/1/versions

2.14.1-1

Source reference: /affected/1/versions

2.14.3-1

Source reference: /affected/1/versions

2.14.6-1

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

nats-server

Source reference: /affected/2/package/name

Affected versions
2.10.27-1

Source reference: /affected/2/versions

2.12.4-1

Source reference: /affected/2/versions

Fixed versions
2.12.6-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "nats-server",
      "purl": "pkg:deb/debian/nats-server?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.10.1-1",
      "2.10.16-1",
      "2.10.18-1",
      "2.10.24-1",
      "2.10.27-1",
      "2.10.3-1",
      "2.10.4-1",
      "2.10.7-1",
      "2.12.4-1",
      "2.12.6-1",
      "2.14.1-1",
      "2.14.3-1",
      "2.14.6-1",
      "2.9.10-1",
      "2.9.19-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33246.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "nats-server",
      "purl": "pkg:deb/debian/nats-server?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.10.27-1",
      "2.12.4-1",
      "2.12.6-1",
      "2.14.1-1",
      "2.14.3-1",
      "2.14.6-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33246.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.12.6-1"
          }
        ]
      }
    ],
    "package": {
      "name": "nats-server",
      "purl": "pkg:deb/debian/nats-server?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.10.27-1",
      "2.12.4-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33246.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#55931 · Revision 1
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Publisher date
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