Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2026-07-14 15:47

Modified

2026-07-14 16:10

Summary

NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory

Details

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "nats",
        "purl": "pkg:bitnami/nats"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.12.12"
            },
            {
              "introduced": "2.14.0"
            },
            {
              "fixed": "2.14.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-58210"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:nats:nats_server:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.",
  "id": "BIT-nats-2026-58210",
  "modified": "2026-07-14T16:10:26.025Z",
  "published": "2026-07-14T15:47:12.837Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nats-io/nats-server/releases/tag/v2.12.12"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nats-io/nats-server/releases/tag/v2.14.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58210"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory"
}

CVE-2026-58210 (GCVE-0-2026-58210)

Vulnerability from cvelistv5 – Published: 2026-07-08 20:13 – Updated: 2026-07-09 13:29

Title

NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M

References

5 references

URL	Tags
https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
https://github.com/nats-io/nats-server/commit/bce…	x_refsource_MISC
https://github.com/nats-io/nats-server/commit/e01…	x_refsource_MISC
https://github.com/nats-io/nats-server/releases/t…	x_refsource_MISC
https://github.com/nats-io/nats-server/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
nats-io	nats-server	Affected: < 2.12.12 Affected: >= 2.14.0-RC.1, < 2.14.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-58210",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T13:29:25.711675Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-09T13:29:36.341Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.12.12"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.14.0-RC.1, \u003c 2.14.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-08T20:13:37.082Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg"
        },
        {
          "name": "https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861"
        },
        {
          "name": "https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5"
        },
        {
          "name": "https://github.com/nats-io/nats-server/releases/tag/v2.12.12",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nats-io/nats-server/releases/tag/v2.12.12"
        },
        {
          "name": "https://github.com/nats-io/nats-server/releases/tag/v2.14.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nats-io/nats-server/releases/tag/v2.14.3"
        }
      ],
      "source": {
        "advisory": "GHSA-r72h-j7qq-v6qg",
        "discovery": "UNKNOWN"
      },
      "title": "NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-58210",
    "datePublished": "2026-07-08T20:13:37.082Z",
    "dateReserved": "2026-06-29T17:09:25.872Z",
    "dateUpdated": "2026-07-09T13:29:36.341Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2026-58210 (GCVE-0-2026-58210)

Tags

Sightings

Nomenclature