GHSA-FCJP-H8CC-6879
Vulnerability from github – Published: 2026-03-24 21:39 – Updated: 2026-03-24 21:39
VLAI?
Summary
NATS is vulnerable to MQTT hijacking via Client ID
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
Sessions and Messages can by hijacked via MQTT Client ID malfeasance.
Affected Versions
Any version before v2.12.6 or v2.11.15
Workarounds
None.
Resources
- This document is canonically: https://advisories.nats.io/CVE/secnote-2026-06.txt
- GHSA advisory: https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879
- MITRE CVE entry: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33215
Severity ?
6.5 (Medium)
{
"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-2026-33215"
],
"database_specific": {
"cwe_ids": [
"CWE-287"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-24T21:39:52Z",
"nvd_published_at": "2026-03-24T21:16:28Z",
"severity": "MODERATE"
},
"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\nSessions and Messages can by hijacked via MQTT Client ID malfeasance.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nNone.\n\n### Resources\n\n * This document is canonically: \u003chttps://advisories.nats.io/CVE/secnote-2026-06.txt\u003e\n * GHSA advisory: \u003chttps://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879\u003e\n * MITRE CVE entry: \u003chttps://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33215\u003e",
"id": "GHSA-fcjp-h8cc-6879",
"modified": "2026-03-24T21:39:52Z",
"published": "2026-03-24T21:39:52Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33215"
},
{
"type": "WEB",
"url": "https://advisories.nats.io/CVE/secnote-2026-06.tx"
},
{
"type": "PACKAGE",
"url": "https://github.com/nats-io/nats-server"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L",
"type": "CVSS_V3"
}
],
"summary": "NATS is vulnerable to MQTT hijacking via Client ID"
}
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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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