CVE-2026-58211

mediumpriority · track · 0OT risk · elevatedEPSS 0.003 · 22 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.29% (22nd) EPSS

CVSS 5.4 · medium

Is it mine?

11 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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 client could be registered as the configured no_auth_user through a parser path used when the first client operation was not CONNECT, bypassing user-level connection restrictions such as allowed_connection_types or proxy_required that normal authentication would apply. This issue is fixed in versions 2.14.3 and 2.12.12.

cvss

Technical severity, 0–10. One row per scoring source.

5.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 2.5

v3.15mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863US

affected products (11)

Products and version ranges known to be affected.

Microsoft Azure Linux azl3all versionscert_bundDEcpe:/o:microsoft:azure_linux:azl3
Open Source NATS Server <2.11.17all versionscert_bundDE
Open Source NATS Server <2.12.12all versionscert_bundDE
Open Source NATS Server <2.14.3all versionscert_bundDE
Open Source NATS Server< 2.11.17cert_bundDE
Open Source NATS Server< 2.12.12cert_bundDE
Open Source NATS Server< 2.14.3cert_bundDE
nats-io nats-server≤ < 2.12.12enisa_euvdEU
nats-io nats-server2.14.0-RC.1, → 2.14.3enisa_euvdEU
linuxfoundation nats-server2.12.0 → 2.12.12nvdUScpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
linuxfoundation nats-server2.14.0 → 2.14.3nvdUScpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2132NATS Server: Mehrere SchwachstellenDeutsch2026-06-29csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in NATS Server ausnutzen, um beliebigen Programmcode auszuführen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-07-08modified 2026-10-25

references (4)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan