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I. Basic Information for CVE-2026-33218
Vulnerability Information
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Vulnerability Title
NATS has pre-auth server panic via leafnode handling
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, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nats-Server 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于客户端可发送特定畸形消息，可能导致服务器崩溃。
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-2026-33218
#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
kimi-k2.5 · 9858 chars
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III. Intelligence Information for CVE-2026-33218
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IV. Related Vulnerabilities
Same product: nats-server
Same vendor: nats-io
Same weakness: CWE-20
V. Comments for CVE-2026-33218

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