CVE-2026-95846: Moquette is a lightweight Java MQTT broker

Q: How do I fix CVE-2026-95846?

moquette: upgrade to 0.18.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-95846 being exploited?

CVE-2026-95846 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-95846 affect?

CVE-2026-95846 affects moquette. Severity is high (CVSS 7.5). Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.publishWill publishes a client's Last-Will message without applying the canWrite authorization and reserved-topic checks used for a normal PUBLISH. A client can configu

Q: How urgent is CVE-2026-95846?

Priority 42/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-95846 is a high-severity flaw (CVSS 7.5) affecting moquette. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.publishWill publishes a client's Last-Will message without applying the canWrite authorization and reserved-topic checks used for a normal PUBLISH. A client can configure a Will for a topic that the client is not permitted to write and cause the broker to publish the unauthorized message when the client disconnects unexpectedly. This issue allows unauthorized message injectio

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-09-23
Last modified	2026-09-25

Publisher (CNA): GitHub, Inc. · Vendor: moquette

Last updated 2026-09-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-23 17:17 UTCPublished CVE record published
2026-09-25 13:34 UTCUpdated Record last modified

moquette moquette UPGRADE

Affected: < 0.18.1

Fixed in: 0.18.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy moquette || rpm -q moquette || moquette --version

2. UPGRADE to 0.18.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade moquette

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade moquette

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-95846?

moquette: upgrade to 0.18.1. Exact commands for each OS are on this page.

Is CVE-2026-95846 being exploited?

CVE-2026-95846 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-95846 affect?

CVE-2026-95846 affects moquette. Severity is high (CVSS 7.5). Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.publishWill publishes a client's Last-Will message without applying the canWrite authorization and reserved-topic checks used for a normal PUBLISH. A client can configu

How urgent is CVE-2026-95846?

Priority 42/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-95844 HIGH 7.5 UPGRADE Moquette is a lightweight Java MQTT broker
CVE-2026-95847 HIGH 7.5 UPGRADE Moquette is a lightweight Java MQTT broker
CVE-2026-95848 CRITICAL 9.1 UPGRADE Moquette is a lightweight Java MQTT broker
CVE-2026-85724 CRITICAL 9.6 UPGRADE Moquette is a lightweight Java MQTT broker
CVE-2026-95842 HIGH 7.5 UPGRADE Moquette is a lightweight Java MQTT broker

References

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