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CVE-2026-33248— NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching

CVSS 4.2 · Medium EPSS 0.03% · P8
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I. Basic Information for CVE-2026-33248

Vulnerability Information
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Vulnerability Title
NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching
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 mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their `DN` construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nats-Server 信任管理问题漏洞
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之前版本存在信任管理问题漏洞，该漏洞源于使用mTLS进行客户端身份验证时，某些RDN模式未正确强制执行，可能导致身份验证绕过。
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-2026-33248

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III. Intelligence Information for CVE-2026-33248

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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-2026-332236.4 MEDIUMNATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing
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

IV. Related Vulnerabilities

Same product: nats-server
Same vendor: nats-io
Same weakness: CWE-287

V. Comments for CVE-2026-33248

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