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CVE-2026-58250— NATS Server: Pre-auth server crash via double INFO in leafnode handshake

CVSS 7.5 · High EPSS 0.51% · P40

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProductVersion RangeStatus
nats-ionats-server< 2.11.17affected
>= 2.12.0-preview.1, < 2.12.8affected
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I. Basic Information for CVE-2026-58250

Vulnerability Information
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Vulnerability Title
NATS Server: Pre-auth server crash via double INFO in leafnode handshake
Source: CVE Program / CVE List V5
Vulnerability Description
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
NATS Server 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nats Server是Nats团队的一款服务端软件产品。 NATS Server 2.12.8之前版本和2.11.17之前版本存在异常处理不当漏洞，该漏洞源于未验证的对等端在认证和帐户设置完成前发送重复的leafnode INFO协议消息，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 < 2.11.17 -

II. Public POCs for CVE-2026-58250

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8280 chars
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-58250

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Patches & Fixes for CVE-2026-58250 (2)

Vendor Advisories for CVE-2026-58250 (1)

Vendor Pages for CVE-2026-58250 (2)

Same Patch Batch · nats-io · 2026-07-08 · 12 CVEs total

CVE-2026-582538.8 HIGHNATS Server: Route API Auth Bypass
CVE-2026-582077.7 HIGHNATS Server: Remote crash via integer overflow in Connz pagination
CVE-2026-582107.5 HIGHNATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory
CVE-2026-582137.1 HIGHNATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbit
CVE-2026-582086.8 MEDIUMNATS Server: MQTT-over-WebSocket Path Can Crash WebSocket-Only JetStream Servers Before MQ
CVE-2026-582516.5 MEDIUMNATS Server: Queue Subscribe Authz Bypass
CVE-2026-582526.5 MEDIUMNATS Server: Subscribe Authz Bypass via Wildcard-Overlap
CVE-2026-582115.4 MEDIUMNATS Server: `no_auth_user` pre-CONNECT fast path bypasses user connection restrictions
CVE-2026-582144.3 MEDIUMNATS Server: MQTT subscribe ACL bypass via $MQTT.deliver.pubrel prefix (incomplete fix for
CVE-2026-582094.3 MEDIUMNATS Server: MQTT retained and QoS replay bypass subscribe deny filters
CVE-2026-58254NATS Server: Incomplete fix for CVE-2026-33249: Leaf node connections bypass Nats-Trace-De

IV. Related Vulnerabilities

Same product: nats-server
Same vendor: nats-io
Same weakness: CWE-476

V. Comments for CVE-2026-58250

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