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

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2.12.6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。

CVSS 6.4 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
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2.12.6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

Vendor Product Affected Versions CPE Subscribe
nats-io nats-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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Vendor Advisories for CVE-2026-33223 (1)

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

CVE-2026-33216 8.6 HIGH NATS has MQTT plaintext password disclosure
CVE-2026-27889 7.5 HIGH NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead
CVE-2026-29785 7.5 HIGH NATS Server panic via malicious compression on leafnode port
CVE-2026-33218 7.5 HIGH NATS has pre-auth server panic via leafnode handling
CVE-2026-33247 7.4 HIGH NATS credentials are exposed in monitoring port via command-line argv
CVE-2026-33217 7.1 HIGH NATS allows MQTT clients to bypass ACL checks
CVE-2026-33246 6.4 MEDIUM NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers
CVE-2026-33219 5.3 MEDIUM NATS is vulnerable to pre-auth DoS through WebSockets client service
CVE-2026-33222 4.9 MEDIUM NATS JetStream has an authorization bypass through its Management API
CVE-2026-33249 4.3 MEDIUM NATS: Message tracing can be redirected to arbitrary subject
CVE-2026-33248 4.2 MEDIUM NATS 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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