Detections
Analytics

Echo: github.com/nats-io/nats-server/v2: security update to 2.11.15

high Tenable Cloud Security Plugin ID 455393

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. Prior to
 versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause
 unbounded memory use in the nats-server before authentication; this requires sending a corresponding
 amount of data. This is a milder variant of CVE-2026-27571. That earlier issue was a compression bomb,
 this vulnerability is not. Attacks against this new issue thus require significant client bandwidth.
 Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable websockets if not required for project
 deployment. (CVE-2026-33219)

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://advisory.echohq.com/cve/CVE-2026-33219

Plugin Details

Severity: High

ID: 455393

Version: Revision 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-33219

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 3/24/2026

Reference Information

CVE: CVE-2026-33219