PT-2026-27613 · Nats.Io · Nats Server

Published 2026-03-24 · Updated 2026-05-21 · CVE-2026-33216

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions NATS-Server versions prior to 2.11.15 NATS-Server versions prior to 2.12.6

Description NATS-Server, a high-performance server for NATS.io, a cloud and edge native messaging system, contains an issue where MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints in MQTT deployments using usercodes and passwords. As a result, sensitive password information may be accessible through these endpoints. It is recommended to adequately secure monitoring endpoints and avoid exposing them to untrusted networks.

Recommendations Update NATS-Server to version 2.11.15 or later. Update NATS-Server to version 2.12.6 or later. Ensure monitoring endpoints are adequately secured. Avoid exposing the monitoring endpoint to the Internet or other untrusted network users.

Exploit

Fix

Weakness Enumeration

CWE-256

Related Identifiers

BIT-NATS-2026-33216

CVE-2026-33216

GHSA-V722-JCV5-W7MC

GO-2026-4836

SUSE-SU-2026:1135-1

Affected Products

Nats Server

References · 160

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33216.json · Exploit
• https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc · Vendor Advisory
• https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099 · Patch
• https://osv.dev/vulnerability/GO-2026-4836 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-v722-jcv5-w7mc · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-APP-GOBINARY-CVE-2026-33216 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33216 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-nats-2026-33216 · Vendor Advisory
• https://advisories.nats.io/CVE/secnote-2026-05.txt · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33216 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-33216 · Security Note
• https://osv.dev/vulnerability/CVE-2026-33216 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33216 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33216 · Vendor Advisory