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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-58251

32
FAUCET Score

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

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

Impacted Technologies

VendorProductVersion(s)CPE
< 2.11.16CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
>= 2.12.0, < 2.12.7CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.34%
Probability of exploitation in next 30 days
EPSS Percentile
26.4%
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 35th percentile among its peer group of 21,958 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (2)

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-2026-58251Moderate

NATS Server: Queue Subscribe Authz Bypass

Jul 2, 2026

References

github.com / nats-io/nats-server/commit/013586288078def45a6788096924eb4d150db65c
Patch
github.com / nats-io/nats-server/commit/79c2f6e9ff87f594596337b6427dda85c38d1fe1
Patch
github.com / nats-io/nats-server/commit/b9ffb63b85e7db3d25a13b2e234f5f7f7c13164d
Patch
github.com / nats-io/nats-server/releases/tag/v2.11.16
Release Notes
github.com / nats-io/nats-server/releases/tag/v2.12.7
Release Notes
github.com / nats-io/nats-server/releases/tag/v2.14.0
Release Notes
github.com / nats-io/nats-server/security/advisories/GHSA-jx8g-9g95-6322
Vendor Advisory