CVE-2026-58253

highpriority · track · 0EPSS 0.004 · 31 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.37% (31st) EPSS

CVSS 8.8 · high

Is it mine?

16 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

cvss

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

8.8

010

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

v3.18.8highAV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:Lsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:Lsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:Lsecondary · security-advisories@github.comexploitability 2.8 · impact 5.3

v3.18.1highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L/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-287USCWE-287US

affected products (16)

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≤ < 2.11.16enisa_euvdEU
nats-io nats-server2.12.0-preview.1, → 2.12.6enisa_euvdEU
Synadia Communications Inc. NATS≤ 2.14.0fstec_bduRU
Synadia Communications Inc. NATS≤ 2.11.15fstec_bduRU
Synadia Communications Inc. NATS≤ 2.12.6fstec_bduRU
linuxfoundation nats-server< 2.11.16nvdUScpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
linuxfoundation nats-server2.12.0 → 2.12.7nvdUScpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
Bitnami nats< 2.11.16osvUSpkg:bitnami/nats
Bitnami nats2.12.0 → 2.12.6osvUSpkg:bitnami/nats

advisories (2)

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.
BIT-nats-2026-58253NATS Server: Route API Auth Bypass2026-07-14vendor · osvUS
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, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv cert_bund nvd NVD CVE.org MITRE

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

references (22)

External citations — patches, advisories, analysis.

scry

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