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SCA: security update for github.com/nats-io/nats-server/v2 (GHSA-55h8-8g96-x4hj)

medium Tenable Cloud Security Plugin ID 439155

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-
 server offers a `Nats-Request-Info:` message header, providing information about a request. This is
 supposed to provide enough information to allow for account/user identification, such that NATS clients
 could make their own decisions on how to trust a message, provided that they trust the nats-server as a
 broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged
 too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS
 clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the
 nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical
 client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known
 workarounds are available. (CVE-2026-33246)

Solution

Update the github.com/nats-io/nats-server/v2 library and its related packages to version 2.11.15 or later.

See Also

https://github.com/advisories/GHSA-55h8-8g96-x4hj

Plugin Details

Severity: Medium

ID: 439155

Version: Revision 1.8

Type: Local

Family: SCA Checks

Published: 3/25/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 7.71

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

CVSS Score Source: CVE-2026-33246

CVSS v3

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 3/24/2026

Vulnerability Publication Date: 3/24/2026

Reference Information

CVE: CVE-2026-33246