Vulnerability details
CVE-2026-33216
nats-io nats-server
NATS has MQTT plaintext password disclosure
CVSS 3.1
8.6High
Official description
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.6High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
| 8.6High | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| nats-io | nats-server | < 2.11.15 | CVEProject cvelistV5 (CNA) |
| nats-io | nats-server | >= 2.12.0-RC.1, < 2.12.6 | CVEProject cvelistV5 (CNA) |
References and advisories
9- https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc x_refsource_CONFIRM
- https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099 x_refsource_MISC
- https://advisories.nats.io/CVE/secnote-2026-05.txt x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2026-33216 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2451448 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33216.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:22347 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:23345 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21769 vendor-advisoryx_refsource_REDHAT
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Details
- Published
- 2026-03-25
- Last updated
- 2026-09-09
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.37%
Probability of exploitation in 30 days
31.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-256Plaintext Storage of a Password
- CWE-213Exposure of Sensitive Information Due to Incompatible Policies