PT-2026-27519 · Nats.Io · Nats Server

Philpennock · Published 2026-03-24 · Updated 2026-05-21 · CVE-2026-33215

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

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 a flaw where sessions and messages can be hijacked via MQTT Client ID malfeasance. The nats-server provides an MQTT client interface. No workarounds are available.

Recommendations Update to version 2.11.15 or later. Update to version 2.12.6 or later.

Exploit

Fix

Improper Authentication

Weakness Enumeration

CWE-488

CWE-287

Related Identifiers

BIT-NATS-2026-33215

CVE-2026-33215

GHSA-FCJP-H8CC-6879

GO-2026-4833

SUSE-SU-2026:1135-1

Affected Products

Nats Server

References · 158

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33215.json · Exploit
• https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33215 · Security Note
• https://ubuntu.com/security/CVE-2026-33215 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4833 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33215 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-APP-GOBINARY-CVE-2026-33215 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33215 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-33215 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-nats-2026-33215 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33215 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-fcjp-h8cc-6879 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33215 · Vendor Advisory
• https://github.com/nats-io/nats-server · Note