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I. Basic Information for CVE-2026-33217
Vulnerability Information
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Vulnerability Title
NATS allows MQTT clients to bypass ACL checks
Source: NVD (National Vulnerability Database)
Vulnerability Description
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, when using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
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2.12.6之前版本存在安全漏洞，该漏洞源于ACL未应用于特定命名空间，可能导致MQTT客户端绕过ACL检查。
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
VendorProductAffected VersionsCPESubscribe
nats-ionats-server < 2.11.15 -
II. Public POCs for CVE-2026-33217
#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
kimi-k2.5 · 7587 chars
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III. Intelligence Information for CVE-2026-33217
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IV. Related Vulnerabilities
Same product: nats-server
Same vendor: nats-io
Same weakness: CWE-863
V. Comments for CVE-2026-33217

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