# github.com/nats-io/nats-server (Go) vulnerabilities

Source: https://junglewise.ai/threats/technologies/github-com-nats-io-nats-server  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/github-com-nats-io-nats-server.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 22 vulnerabilities in github.com/nats-io/nats-server (Go): 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-33246, was published on 26 March 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 22 (0 critical, 0 exploited in the wild)

## About github.com/nats-io/nats-server (Go)

NATS server messaging system providing publish-subscribe and request-reply patterns.

## Latest github.com/nats-io/nats-server (Go) vulnerabilities

- [CVE-2026-33246: GO-2026-4830 - NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers in…](https://junglewise.ai/threats/cve-2026-33246-nats-leafnode-connections-allow-spoofing-of-nats-request-info) (low, CVSS 3.1, published 26 Mar 2026)
- [CVE-2026-33215: GO-2026-4833 - NATS is vulnerable to MQTT hijacking via Client ID in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2026-33215-nats-is-vulnerable-to-mqtt-hijacking-via-client-id) (low, CVSS 3.1, published 26 Mar 2026)
- [CVE-2026-33223: NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing](https://junglewise.ai/threats/cve-2026-33223-nats-server-incomplete-stripping-of-nats-request-info-header) (low, CVSS 3.1, published 26 Mar 2026)
- [CVE-2026-33222: GO-2026-4832 - NATS JetStream has an authorization bypass through its Management API in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2026-33222-nats-jetstream-has-an-authorization-bypass-through-its-management) (low, CVSS 3.1, published 26 Mar 2026)
- [CVE-2026-33249: GO-2026-4826 - NATS: Message tracing can be redirected to arbitrary subject in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2026-33249-nats-message-tracing-can-be-redirected-to-arbitrary-subject) (low, CVSS 3.1, published 26 Mar 2026)
- [CVE-2026-33248: NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching](https://junglewise.ai/threats/cve-2026-33248-nats-has-mtls-verify-and-map-authentication-bypass-via-incorrect) (low, CVSS 3.1, published 26 Mar 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-2026-27571: GO-2026-4533 - nats-server websockets are vulnerable to pre-auth memory DoS in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2026-27571-nats-server-websockets-are-vulnerable-to-pre-auth-memory-dos) (low, CVSS 3.1, published 25 Feb 2026)
- [CVE-2020-28466: GO-2022-0855 - Denial of service in github.com/nats-io/nats-server/server in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2020-28466-denial-of-service-in-github-com-nats-io-nats-server-server) (low, CVSS 3.1, published 21 Aug 2024)
- [CVE-2019-13126: GO-2022-0852 - Integer Overflow or Wraparound in NATS Server in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2019-13126-integer-overflow-or-wraparound-in-nats-server) (low, CVSS 3.1, published 21 Aug 2024)
- [GO-2022-0398 - Import loops in account imports, nats-server DoS in github.com/nats-io/nats-server](https://junglewise.ai/threats/go-2022-0398-import-loops-in-account-imports-nats-server-dos-in-github-0f9787de) (info, published 21 Aug 2024)
- [CVE-2022-26652: GO-2022-0351 - Arbitrary file write in nats-server in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2022-26652-arbitrary-file-write-in-nats-server) (low, CVSS 3.1, published 21 Aug 2024)
- [CVE-2022-24450: GO-2022-0307 - Incorrect Authorization in NATS nats-server in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2022-24450-incorrect-authorization-in-nats-nats-server) (low, CVSS 3.1, published 21 Aug 2024)
- [CVE-2022-28357: NATS nats-server allows directory traversal via unintended path to a management action](https://junglewise.ai/threats/cve-2022-28357-nats-nats-server-allows-directory-traversal-via-unintended-path) (low, CVSS 3.1, published 21 Aug 2024)
- [CVE-2022-29946: NATS Server and Streaming Server fails to enforce negative user permissions, may allow denied subjects](https://junglewise.ai/threats/cve-2022-29946-nats-server-and-streaming-server-fails-to-enforce-negative-user) (low, CVSS 3.1, published 12 Jul 2024)
- [CVE-2021-32026: GO-2024-2850 - NATS server TLS missing ciphersuite settings when CLI flags used in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2021-32026-nats-server-tls-missing-ciphersuite-settings-when-cli-flags-used) (info, published 5 Jun 2024)

## Most severe github.com/nats-io/nats-server (Go) vulnerabilities

- [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-2026-33218: 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-2026-33247: 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-2026-33217: 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-2026-33219: 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-2020-28466: GO-2022-0855 - Denial of service in github.com/nats-io/nats-server/server in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2020-28466-denial-of-service-in-github-com-nats-io-nats-server-server) (low, CVSS 3.1, published 21 Aug 2024)
- [CVE-2022-26652: GO-2022-0351 - Arbitrary file write in nats-server in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2022-26652-arbitrary-file-write-in-nats-server) (low, CVSS 3.1, published 21 Aug 2024)
- [CVE-2019-13126: GO-2022-0852 - Integer Overflow or Wraparound in NATS Server in github.com/nats-io/nats-server](https://junglewise.ai/threats/cve-2019-13126-integer-overflow-or-wraparound-in-nats-server) (low, CVSS 3.1, published 21 Aug 2024)

## 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 |

## Other Go technologies

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- [code.vikunja.io/api (Go)](https://junglewise.ai/threats/technologies/code-vikunja-io-api): 91 vulnerabilities
- [gogs.io/gogs (Go)](https://junglewise.ai/threats/technologies/gogs-io-gogs): 81 vulnerabilities
- [github.com/traefik/traefik/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-traefik-traefik-v2): 78 vulnerabilities
- [github.com/traefik/traefik (Go)](https://junglewise.ai/threats/technologies/github-com-traefik-traefik): 75 vulnerabilities
- [github.com/usememos/memos (Go)](https://junglewise.ai/threats/technologies/github-com-usememos-memos): 75 vulnerabilities

## 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, "github.com/nats-io/nats-server (Go) vulnerabilities", https://junglewise.ai/threats/technologies/github-com-nats-io-nats-server, 13 November 2026.