GHSA-V722-JCV5-W7MC
Vulnerability from github – Published: 2026-03-24 21:42 – Updated: 2026-03-24 21:42
VLAI?
Summary
NATS has MQTT plaintext password disclosure
Details
Background
NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.
The nats-server provides an MQTT client interface.
Problem Description
For MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints.
Affected Versions
Any version before v2.12.6 or v2.11.15
Workarounds
Ensure monitoring end-points are adequately secured.
Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.
Severity ?
8.6 (High)
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/nats-io/nats-server/v2"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.11.15"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/nats-io/nats-server/v2"
},
"ranges": [
{
"events": [
{
"introduced": "2.12.0-RC.1"
},
{
"fixed": "2.12.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-33216"
],
"database_specific": {
"cwe_ids": [
"CWE-256"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-24T21:42:10Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nThe nats-server provides an MQTT client interface.\n\n### Problem Description\n\nFor MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nEnsure monitoring end-points are adequately secured.\n\nBest practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.",
"id": "GHSA-v722-jcv5-w7mc",
"modified": "2026-03-24T21:42:10Z",
"published": "2026-03-24T21:42:10Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc"
},
{
"type": "WEB",
"url": "https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099"
},
{
"type": "WEB",
"url": "https://advisories.nats.io/CVE/secnote-2026-05.txt"
},
{
"type": "PACKAGE",
"url": "https://github.com/nats-io/nats-server"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "NATS has MQTT plaintext password disclosure"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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