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Not in CISA KEV
HIGH severity

NATS has MQTT plaintext password disclosureGHSA-v722-jcv5-w7mc

HIGHFix: nats-io/nats-server@b5b63cf

GHSA-v722-jcv5-w7mc is a high-severity (CVSS 8.6) CWE-256 vulnerability in github.com/nats-io/nats-server/v2. A fix is available for github.com/nats-io/nats-server/v2 — see the affected versions and patch details below.

Also known asBIT-nats-2026-33216CVE-2026-33216GO-2026-4836
Published
Updated
Affected
3 pkgs
Patched
2 / 3
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-v722-jcv5-w7mc.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs31th percentile — riskier than 31% of all scored CVEsHighest risk
0.00%0.38%0.75%1.13%0.0%0.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected
🐹github.com/nats-io/nats-server/v2🐹github.com/nats-io/nats-server/v2🐹github.com/nats-io/nats-server

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

3 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/nats-io/nats-server/v2all versions2.11.15go get github.com/nats-io/nats-server/v2@v2.11.15
🐹Gogithub.com/nats-io/nats-server/v2≥ 2.12.0-RC.1&&< 2.12.62.12.6go get github.com/nats-io/nats-server/v2@v2.12.6
🐹Gogithub.com/nats-io/nats-serverall versionsNo fix

Affected Products

1 product · 2 configurations
Application
nats-serverlinuxfoundation
≥ 2.12.0 && < 2.12.6
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/nats-io/nats-server/v2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/nats-io/nats-server/v2 to 2.11.15 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-v722-jcv5-w7mc is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant
Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Source: Red Hat security advisory for GHSA-v722-jcv5-w7mc (CC BY 4.0)
ProductFixed inAdvisory
Multicluster Global Hub 1.4.9multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1779579439RHSA-2026:22347
Multicluster Global Hub 1.6.5multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1780167118RHSA-2026:23345
Red Hat multicluster global hub 1.5.3multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1778867753RHSA-2026:21769

Frequently Asked Questions

### 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 monitori
O3 Security · Impact-Aware SCA

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NATS has MQTT plaintext password disclosure (High 8.6)