CVE-2026-58251
NATS Server: Queue Subscribe Authz Bypass
Description
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.
INFO
Published Date :
July 8, 2026, 8:16 p.m.
Last Modified :
July 13, 2026, 3:23 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update NATS Server to version 2.14.0 or later.
- Apply patches for versions 2.12.7 or 2.11.16 if needed.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-58251.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-58251 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-58251
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-58251 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-58251 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 13, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* versions from (including) 2.12.0 up to (excluding) 2.12.7 *cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.16 Added Reference Type GitHub, Inc.: https://github.com/nats-io/nats-server/commit/013586288078def45a6788096924eb4d150db65c Types: Patch Added Reference Type GitHub, Inc.: https://github.com/nats-io/nats-server/commit/79c2f6e9ff87f594596337b6427dda85c38d1fe1 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/nats-io/nats-server/commit/b9ffb63b85e7db3d25a13b2e234f5f7f7c13164d Types: Patch Added Reference Type GitHub, Inc.: https://github.com/nats-io/nats-server/releases/tag/v2.11.16 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/nats-io/nats-server/releases/tag/v2.12.7 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/nats-io/nats-server/releases/tag/v2.14.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/nats-io/nats-server/security/advisories/GHSA-jx8g-9g95-6322 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 09, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-58251', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-09T13:40:09.306056Z'} -
New CVE Received by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'nats-io', 'product': 'nats-server', 'versions': [{'status': 'affected', 'version': '< 2.11.16'}, {'status': 'affected', 'version': '>= 2.12.0-RC.1, < 2.12.7'}]}] Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-285 Added Reference https://github.com/nats-io/nats-server/commit/013586288078def45a6788096924eb4d150db65c Added Reference https://github.com/nats-io/nats-server/commit/79c2f6e9ff87f594596337b6427dda85c38d1fe1 Added Reference https://github.com/nats-io/nats-server/commit/b9ffb63b85e7db3d25a13b2e234f5f7f7c13164d Added Reference https://github.com/nats-io/nats-server/releases/tag/v2.11.16 Added Reference https://github.com/nats-io/nats-server/releases/tag/v2.12.7 Added Reference https://github.com/nats-io/nats-server/releases/tag/v2.14.0 Added Reference https://github.com/nats-io/nats-server/security/advisories/GHSA-jx8g-9g95-6322