nats-io nats-server up to 2.11.14/2.12.5 MQTT Password cleartext transmission

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.6$0-$5k0.00

Summaryinfo

A vulnerability was found in nats-io nats-server up to 2.11.14/2.12.5. It has been classified as problematic. This affects an unknown function of the component MQTT Password Handler. This manipulation causes cleartext transmission. This vulnerability is tracked as CVE-2026-33216. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in nats-io nats-server up to 2.11.14/2.12.5. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component MQTT Password Handler. The manipulation with an unknown input leads to a cleartext transmission vulnerability. The CWE definition for the vulnerability is CWE-319. The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors. As an impact it is known to affect confidentiality.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33216. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1040 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 303825 (Linux Distros Unpatched Vulnerability : CVE-2026-33216), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.11.15 or 2.12.6 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (303825). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Cleartext transmission
CWE: CWE-319 / CWE-310
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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Nessus ID: 303825
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-33216

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: nats-server 2.11.15/2.12.6

Timelineinfo

03/25/2026 Advisory disclosed
03/25/2026 +0 days VulDB entry created
03/26/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-33216 (🔒)
GCVE (CVE): GCVE-0-2026-33216
GCVE (VulDB): GCVE-100-352987

Entryinfo

Created: 03/25/2026 09:27
Updated: 03/26/2026 23:42
Changes: 03/25/2026 09:27 (52), 03/26/2026 23:42 (2)
Complete: 🔍
Cache ID: 216:672:103

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