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CVE-2026-33223— NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing

CVSS 6.4 · Medium EPSS 0.01% · P1
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I. Basic Information for CVE-2026-33223

Vulnerability Information
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Vulnerability Title
NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing
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, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. 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:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用欺骗进行的认证绕过
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Nats-Request-Info标头剥离不完全，可能导致身份欺骗。
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-2026-33223

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III. Intelligence Information for CVE-2026-33223

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Same Patch Batch · nats-io · 2026-03-25 · 12 CVEs total

CVE-2026-332168.6 HIGHNATS has MQTT plaintext password disclosure
CVE-2026-278897.5 HIGHNATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead
CVE-2026-297857.5 HIGHNATS Server panic via malicious compression on leafnode port
CVE-2026-332187.5 HIGHNATS has pre-auth server panic via leafnode handling
CVE-2026-332477.4 HIGHNATS credentials are exposed in monitoring port via command-line argv
CVE-2026-332177.1 HIGHNATS allows MQTT clients to bypass ACL checks
CVE-2026-332466.4 MEDIUMNATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers
CVE-2026-332195.3 MEDIUMNATS is vulnerable to pre-auth DoS through WebSockets client service
CVE-2026-332224.9 MEDIUMNATS JetStream has an authorization bypass through its Management API
CVE-2026-332494.3 MEDIUMNATS: Message tracing can be redirected to arbitrary subject
CVE-2026-332484.2 MEDIUMNATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching

IV. Related Vulnerabilities

Same product: nats-server
Same vendor: nats-io
Same weakness: CWE-290

V. Comments for CVE-2026-33223

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