PT-2026-27622 · Nats.Io · Nats Server

Published 2026-03-24 · Updated 2026-05-21 · CVE-2026-33249

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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, is affected by an issue where a valid client utilizing message tracing headers can direct trace messages to any valid subject, even those the client lacks publish permissions for. The message payload is a legitimate trace message and is not controlled by an attacker.

Recommendations Update NATS-Server to version 2.11.15 or later. Update NATS-Server to version 2.12.6 or later.

Exploit

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

BIT-NATS-2026-33249

CVE-2026-33249

GHSA-8M2X-3M6Q-6W8J

GO-2026-4826

SUSE-SU-2026:1135-1

Affected Products

Nats Server

References · 156

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33249.json · Exploit
• https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33249 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33249 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33249 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-8m2x-3m6q-6w8j · Vendor Advisory
• https://osv.dev/vulnerability/BIT-nats-2026-33249 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33249 · Security Note
• https://osv.dev/vulnerability/CVE-2026-33249 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-APP-GOBINARY-CVE-2026-33249 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33249 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4826 · Vendor Advisory
• https://advisories.nats.io/CVE/secnote-2026-15.txt · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33249 · Vendor Advisory