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CVE-2026-58252— NATS Server: Subscribe Authz Bypass via Wildcard-Overlap

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团队的一款服务端软件产品。 NATS Server 2.14.0之前版本、2.12.7之前版本和2.11.16之前版本存在授权问题漏洞，该漏洞源于授权问题，当通配符订阅与配置的通配符拒绝规则重叠但并非其子集时，可能导致通过身份验证的用户在拒绝的主题上接收消息，且队列订阅也可能影响合法队列消费者的消息传递。以下版本受到影响：2.14.0之前版本、2.12.7之前版本和2.11.16之前版本。

CVSS 6.5 · Medium EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 2

VendorProduct Version RangeStatus
nats-io nats-server < 2.11.16 affected
>= 2.12.0-preview.1, < 2.12.7 affected
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I. Basic Information for CVE-2026-58252

Vulnerability Information
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Vulnerability Title
NATS Server: Subscribe Authz Bypass via Wildcard-Overlap
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 2.14.0, 2.12.7, and 2.11.16, an authenticated user could receive messages on denied subjects when a wildcard subscription overlapped with a configured wildcard deny rule but was not a subset of it, and queue subscriptions could also affect delivery to legitimate queue consumers. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nats Server 授权问题漏洞
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 2.14.0之前版本、2.12.7之前版本和2.11.16之前版本存在授权问题漏洞，该漏洞源于授权问题，当通配符订阅与配置的通配符拒绝规则重叠但并非其子集时，可能导致通过身份验证的用户在拒绝的主题上接收消息，且队列订阅也可能影响合法队列消费者的消息传递。以下版本受到影响：2.14.0之前版本、2.12.7之前版本和2.11.16之前版本。
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 < 2.11.16 -

II. Public POCs for CVE-2026-58252

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III. Intelligence Information for CVE-2026-58252

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Patches & Fixes for CVE-2026-58252 (3)

Vendor Advisories for CVE-2026-58252 (1)

Vendor Pages for CVE-2026-58252 (2)

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

CVE-2026-58253 8.8 HIGH NATS Server: Route API Auth Bypass
CVE-2026-58207 7.7 HIGH NATS Server: Remote crash via integer overflow in Connz pagination
CVE-2026-58250 7.5 HIGH NATS Server: Pre-auth server crash via double INFO in leafnode handshake
CVE-2026-58210 7.5 HIGH NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory
CVE-2026-58213 7.1 HIGH NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbit
CVE-2026-58208 6.8 MEDIUM NATS Server: MQTT-over-WebSocket Path Can Crash WebSocket-Only JetStream Servers Before MQ
CVE-2026-58251 6.5 MEDIUM NATS Server: Queue Subscribe Authz Bypass
CVE-2026-58211 5.4 MEDIUM NATS Server: `no_auth_user` pre-CONNECT fast path bypasses user connection restrictions
CVE-2026-58214 4.3 MEDIUM NATS Server: MQTT subscribe ACL bypass via $MQTT.deliver.pubrel prefix (incomplete fix for
CVE-2026-58209 4.3 MEDIUM NATS Server: MQTT retained and QoS replay bypass subscribe deny filters
CVE-2026-58254 NATS 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-285

V. Comments for CVE-2026-58252

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