nats-io nats-server up to 2.12.7/2.14.2 Trace improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in nats-io nats-server up to 2.12.7/2.14.2. The impacted element is an unknown function of the component Trace. Such manipulation leads to improper authentication. This vulnerability is listed as CVE-2026-58254. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in nats-io nats-server up to 2.12.7/2.14.2 and classified as problematic. Affected by this issue is an unknown part of the component Trace. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-58254 since 06/29/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 2.12.8 or 2.14.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-2026-97492573). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: nats-server 2.12.8/2.14.3

Timelineinfo

06/29/2026 CVE reserved
07/08/2026 +9 days Advisory disclosed
07/08/2026 +0 days VulDB entry created
07/13/2026 +5 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-58254 (🔒)
GCVE (CVE): GCVE-0-2026-58254
GCVE (VulDB): GCVE-100-376988
CNNVD: CNNVD-2026-97492573 - Nats Server 授权问题漏洞

Entryinfo

Created: 07/08/2026 22:53
Updated: 07/13/2026 19:16
Changes: 07/08/2026 22:53 (53), 07/10/2026 09:01 (6), 07/13/2026 19:16 (23)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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