# NATS Server vulnerabilities

Source: https://junglewise.ai/threats/technologies/nats-server  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/nats-server.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 20 vulnerabilities in NATS Server: 0 in the last 7 days and 0 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-58211, was published on 8 July 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 20 (1 critical, 0 exploited in the wild)

## About NATS Server

A distributed messaging system for cloud native applications, IoT messaging, and microservices architectures.

## Latest NATS Server vulnerabilities

- [CVE-2026-58211: NATS Server authorization bypass in no_auth_user parser path](https://junglewise.ai/threats/cve-2026-58211-nats-server-authorization-bypass-in-no-auth-user-parser-path) (medium, CVSS 5.4, published 8 Jul 2026)
- [CVE-2026-58208: NATS Server denial of service via WebSocket MQTT upgrade](https://junglewise.ai/threats/cve-2026-58208-nats-server-denial-of-service-via-websocket-mqtt-upgrade) (medium, CVSS 6.8, published 8 Jul 2026)
- [CVE-2026-58207: NATS Server integer overflow in Connz pagination monitoring requests](https://junglewise.ai/threats/cve-2026-58207-nats-server-integer-overflow-in-connz-pagination-monitoring) (high, CVSS 7.7, published 8 Jul 2026)
- [CVE-2026-58254: NATS Server authorization bypass in leafnode message tracing](https://junglewise.ai/threats/cve-2026-58254-nats-server-authorization-bypass-in-leafnode-message-tracing) (info, CVSS 5.3, published 8 Jul 2026)
- [CVE-2026-58253: NATS Server authentication bypass in route or leafnode listeners](https://junglewise.ai/threats/cve-2026-58253-nats-server-authentication-bypass-in-route-or-leafnode-listeners) (high, CVSS 8.8, published 8 Jul 2026)
- [CVE-2026-58252: NATS Server authorization bypass via overlapping wildcard subscriptions](https://junglewise.ai/threats/cve-2026-58252-nats-server-authorization-bypass-via-overlapping-wildcard) (medium, CVSS 6.5, published 8 Jul 2026)
- [CVE-2026-58251: NATS Server authorization bypass via queue subscriptions](https://junglewise.ai/threats/cve-2026-58251-nats-server-authorization-bypass-via-queue-subscriptions) (medium, CVSS 6.5, published 8 Jul 2026)
- [CVE-2026-58250: NATS Server NULL pointer dereference in leafnode handshake](https://junglewise.ai/threats/cve-2026-58250-nats-server-null-pointer-dereference-in-leafnode-handshake) (high, CVSS 7.5, published 8 Jul 2026)
- [CVE-2026-58214: NATS Server MQTT authorization bypass in internal subject subscription](https://junglewise.ai/threats/cve-2026-58214-nats-server-mqtt-authorization-bypass-in-internal-subject) (medium, CVSS 4.3, published 8 Jul 2026)
- [CVE-2026-58213: NATS Server protocol injection via MQTT subscription filters](https://junglewise.ai/threats/cve-2026-58213-nats-server-protocol-injection-via-mqtt-subscription-filters) (high, CVSS 7.1, published 8 Jul 2026)
- [CVE-2026-58210: NATS Server denial of service via MQTT memory exhaustion](https://junglewise.ai/threats/cve-2026-58210-nats-server-denial-of-service-via-mqtt-memory-exhaustion) (high, CVSS 7.5, published 8 Jul 2026)
- [CVE-2026-58209: NATS Server MQTT authorization bypass in subscribe deny rules](https://junglewise.ai/threats/cve-2026-58209-nats-server-mqtt-authorization-bypass-in-subscribe-deny-rules) (medium, CVSS 4.3, published 8 Jul 2026)
- [CVE-2026-33247: NATS-Server sensitive information disclosure in monitoring endpoint](https://junglewise.ai/threats/cve-2026-33247-nats-server-sensitive-information-disclosure-in-monitoring) (high, CVSS 7.4, published 25 Mar 2026)
- [CVE-2026-33219: NATS-Server denial of service in WebSockets component](https://junglewise.ai/threats/cve-2026-33219-nats-server-denial-of-service-in-websockets-component) (medium, CVSS 5.3, published 25 Mar 2026)
- [CVE-2026-33218: NATS-Server denial of service in leafnode handling](https://junglewise.ai/threats/cve-2026-33218-nats-server-denial-of-service-in-leafnode-handling) (high, CVSS 7.5, published 25 Mar 2026)
- [CVE-2026-33217: NATS-Server ACL bypass in MQTT namespace](https://junglewise.ai/threats/cve-2026-33217-nats-server-acl-bypass-in-mqtt-namespace) (high, CVSS 7.1, published 25 Mar 2026)
- [CVE-2026-33216: NATS-Server plaintext password disclosure in monitoring endpoints](https://junglewise.ai/threats/cve-2026-33216-nats-server-plaintext-password-disclosure-in-monitoring-endpoints) (high, CVSS 8.6, published 25 Mar 2026)
- [CVE-2026-29785: nats-io nats-server NULL pointer dereference in leafnode protocol](https://junglewise.ai/threats/cve-2026-29785-nats-io-nats-server-null-pointer-dereference-in-leafnode-protocol) (high, CVSS 7.5, published 25 Mar 2026)
- [CVE-2026-27889: NATS Server denial of service via WebSocket frame length overflow](https://junglewise.ai/threats/cve-2026-27889-nats-server-denial-of-service-via-websocket-frame-length-overflow) (high, CVSS 7.5, published 25 Mar 2026)
- [CVE-2025-30215: NATS Server authorization bypass in JetStream admin APIs](https://junglewise.ai/threats/cve-2025-30215-nats-server-authorization-bypass-in-jetstream-admin-apis) (critical, CVSS 9.6, published 15 Apr 2025)

## Most severe NATS Server vulnerabilities

- [CVE-2025-30215: NATS Server authorization bypass in JetStream admin APIs](https://junglewise.ai/threats/cve-2025-30215-nats-server-authorization-bypass-in-jetstream-admin-apis) (critical, CVSS 9.6, published 15 Apr 2025)
- [CVE-2026-58253: NATS Server authentication bypass in route or leafnode listeners](https://junglewise.ai/threats/cve-2026-58253-nats-server-authentication-bypass-in-route-or-leafnode-listeners) (high, CVSS 8.8, published 8 Jul 2026)
- [CVE-2026-33216: NATS-Server plaintext password disclosure in monitoring endpoints](https://junglewise.ai/threats/cve-2026-33216-nats-server-plaintext-password-disclosure-in-monitoring-endpoints) (high, CVSS 8.6, published 25 Mar 2026)
- [CVE-2026-58207: NATS Server integer overflow in Connz pagination monitoring requests](https://junglewise.ai/threats/cve-2026-58207-nats-server-integer-overflow-in-connz-pagination-monitoring) (high, CVSS 7.7, published 8 Jul 2026)
- [CVE-2026-29785: nats-io nats-server NULL pointer dereference in leafnode protocol](https://junglewise.ai/threats/cve-2026-29785-nats-io-nats-server-null-pointer-dereference-in-leafnode-protocol) (high, CVSS 7.5, published 25 Mar 2026)
- [CVE-2026-33218: NATS-Server denial of service in leafnode handling](https://junglewise.ai/threats/cve-2026-33218-nats-server-denial-of-service-in-leafnode-handling) (high, CVSS 7.5, published 25 Mar 2026)
- [CVE-2026-27889: NATS Server denial of service via WebSocket frame length overflow](https://junglewise.ai/threats/cve-2026-27889-nats-server-denial-of-service-via-websocket-frame-length-overflow) (high, CVSS 7.5, published 25 Mar 2026)
- [CVE-2026-58250: NATS Server NULL pointer dereference in leafnode handshake](https://junglewise.ai/threats/cve-2026-58250-nats-server-null-pointer-dereference-in-leafnode-handshake) (high, CVSS 7.5, published 8 Jul 2026)
- [CVE-2026-58210: NATS Server denial of service via MQTT memory exhaustion](https://junglewise.ai/threats/cve-2026-58210-nats-server-denial-of-service-via-mqtt-memory-exhaustion) (high, CVSS 7.5, published 8 Jul 2026)
- [CVE-2026-33247: NATS-Server sensitive information disclosure in monitoring endpoint](https://junglewise.ai/threats/cve-2026-33247-nats-server-sensitive-information-disclosure-in-monitoring) (high, CVSS 7.4, published 25 Mar 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "NATS Server vulnerabilities", https://junglewise.ai/threats/technologies/nats-server, 9 November 2026.