CVE-2026-33247— NATS credentials are exposed in monitoring port via command-line argv
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，该漏洞源于通过命令行提供的凭据在监控端口可见，可能导致凭据泄露。
Possible ATT&CK Techniques 1 AI
T1005 · Data from Local SystemAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nats-io | nats-server | < 2.11.15 |
affected |
>= 2.12.0-RC.1, < 2.12.6 |
affected |
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I. Basic Information for CVE-2026-33247
Vulnerability Information
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Vulnerability Title
NATS credentials are exposed in monitoring port via command-line argv
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, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过Debug信息导致的信息暴露
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，该漏洞源于通过命令行提供的凭据在监控端口可见，可能导致凭据泄露。
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-2026-33247
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-33247 (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-2026-33217 | 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-2026-33223 | 6.4 MEDIUM | NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing |
| 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 |
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