---
id: CVE-2026-58213
title: >-
  NATS Server is a high-performance server for NATS.io, the cloud and edge
  native messaging system
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 N…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-74
vendor: linuxfoundation
product: nats-server
affected:
  - nats-server < 2.12.9
  - 'nats-server >= 2.14.0, < 2.14.1'
patched:
  - nats-server 2.14.1
published: '2026-07-08'
updated: '2026-07-13'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-58213'
references:
  - url: >-
      https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8
    label: security-advisories@github.com
  - url: >-
      https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736
    label: security-advisories@github.com
  - url: >-
      https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9
    label: security-advisories@github.com
  - url: 'https://github.com/nats-io/nats-server/pull/8163'
    label: security-advisories@github.com
  - url: 'https://github.com/nats-io/nats-server/pull/8164'
    label: security-advisories@github.com
  - url: 'https://github.com/nats-io/nats-server/releases/tag/v2.12.9'
    label: security-advisories@github.com
  - url: 'https://github.com/nats-io/nats-server/releases/tag/v2.14.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00441
epssPercentile: 0.35698
ingestedAt: '2026-07-13T15:27:34.227Z'
---

## Overview

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.

## Affected

- `nats-server < 2.12.9`
- `nats-server >= 2.14.0, < 2.14.1`

## Remediation

Upgrade past the affected range:

- `nats-server 2.14.1`