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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-58208

36
FAUCET Score

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, a WebSocket listener could route requests for the MQTT-over-WebSocket path into MQTT handling even when MQTT was not configured, allowing an unauthenticated client with access to the WebSocket listener to reach uninitialized MQTT state and crash the server process. This issue is fixed in versions 2.14.3 and 2.12.12.

First published: Jul 8, 2026Last modified: Jul 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.12.0, < 2.12.12CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
>= 2.14.0, < 2.14.3CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.8MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.34%
Probability of exploitation in next 30 days
EPSS Percentile
26.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0034 is in the 8th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: azl3 telegraf 1.31.0-23 on Azure Linux 3.0Fixed in: 1.31.0-24
microsoftpatch availablevia msrc
Product: 21481-17084Fixed in: 1.31.0-24

Vendor Advisories (1)

microsoft2026-Jul/CVE-2026-58208Moderate

NATS Server: MQTT-over-WebSocket Path Can Crash WebSocket-Only JetStream Servers Before MQTT Is Enabled

Jul 2, 2026

References

github.com / nats-io/nats-server/commit/73b3dd9a5ea0fa7bf08b702338676355b29b5fb4
Patch
github.com / nats-io/nats-server/commit/837536b98b3a9280b993282155ff2bdd3ca38c30
Patch
github.com / nats-io/nats-server/releases/tag/v2.12.12
Release Notes
github.com / nats-io/nats-server/releases/tag/v2.14.3
Release Notes
github.com / nats-io/nats-server/security/advisories/GHSA-p957-7v2w-g93g
MitigationVendor Advisory