CVE-2026-33215— NATS is vulnerable to MQTT hijacking via Client ID
Quick assessment
Affected
nats-io nats-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Nats-Server是Nats开源的一个用于 Nats.io、云和边缘本机消息传递系统的高性能服务器。 NATS-Server 2.11.15之前版本和2.12.5之前版本存在安全漏洞，该漏洞源于MQTT客户端ID不当操作，可能导致会话和消息被劫持。
Possible ATT&CK Techniques 1 AI
T1078 · Valid Accounts
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I. Basic Information for CVE-2026-33215
Vulnerability Information
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Vulnerability Title
NATS is vulnerable to MQTT hijacking via Client ID
Source: CVE Program / CVE List V5
Vulnerability Description
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nats-Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nats-Server是Nats开源的一个用于 Nats.io、云和边缘本机消息传递系统的高性能服务器。 NATS-Server 2.11.15之前版本和2.12.5之前版本存在安全漏洞，该漏洞源于MQTT客户端ID不当操作，可能导致会话和消息被劫持。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| nats-io | nats-server | < 2.11.15 | - |
|
II. Public POCs for CVE-2026-33215
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-33215 (1)
-
MQTT hijacking via Client ID · Advisory · nats-io/nats-server · GitHub x_refsource_CONFIRM
IV. Related Vulnerabilities
Same product: nats-server
-
CVE-2026-58208
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CVE-2026-58211
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CVE-2026-58207
NATS Server: Remote crash via integer overflow in Connz pagi -
CVE-2026-58210
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CVE-2026-58209
NATS Server: MQTT retained and QoS replay bypass subscribe d
Same vendor: nats-io
-
CVE-2026-58208
NATS Server: MQTT-over-WebSocket Path Can Crash WebSocket-On -
CVE-2026-58211
NATS Server: `no_auth_user` pre-CONNECT fast path bypasses u -
CVE-2026-58207
NATS Server: Remote crash via integer overflow in Connz pagi -
CVE-2026-58210
NATS Server: MQTT partial CONNECT packets can exhaust pre-au -
CVE-2026-58209
NATS Server: MQTT retained and QoS replay bypass subscribe d
Same weakness: CWE-287
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V. Comments for CVE-2026-33215
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