PT-2026-27619 · Nats · Nats Server

Published 2026-03-24 · Updated 2026-03-27 · CVE-2026-33246

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/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 provides a Nats-Request-Info: message header intended for account or user identification, allowing clients to make trust decisions based on information from the server. A leafnode connecting to a NATS-Server is not fully trusted unless the system account is bridged. Consequently, identity claims should not be propagated without verification. Prior to versions 2.11.15 and 2.12.6, the Nats-Request-Info: header could be spoofed, potentially impacting clients relying on this header for trust decisions. This issue does not directly affect the NATS-Server itself.

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

Exploit

Fix

Improper Authentication

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-287

CWE-290

Related Identifiers

BIT-NATS-2026-33246

CVE-2026-33246

GHSA-55H8-8G96-X4HJ

GO-2026-4830

SUSE-SU-2026:1135-1

Affected Products

Nats Server

References · 156

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33246.json · Exploit
• https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-55h8-8g96-x4hj · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4830 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33246 · Vendor Advisory
• https://advisories.nats.io/CVE/secnote-2026-08.txt · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33246 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33246 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33246 · Security Note
• https://osv.dev/vulnerability/BIT-nats-2026-33246 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33246 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33246 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33246 · Vendor Advisory
• https://github.com/nats-io/nats-server · Note