CVE-2026-95848: Moquette is a lightweight Java MQTT broker

Q: How do I fix CVE-2026-95848?

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

Q: Is CVE-2026-95848 being exploited?

CVE-2026-95848 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-2026-95848 affect?

CVE-2026-95848 affects moquette. Severity is critical (CVSS 9.1). Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when a configured authenticator or authorizator class cannot be loaded, Server.initializeAuthenticator and Server.initializeAuthorizatorPolicy treat the failure as though no custo

Q: How urgent is CVE-2026-95848?

Priority 51/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-95848 is a critical-severity flaw (CVSS 9.1) 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, when a configured authenticator or authorizator class cannot be loaded, Server.initializeAuthenticator and Server.initializeAuthorizatorPolicy treat the failure as though no custom class was configured and fall back to AcceptAllAuthenticator or PermitAllAuthorizatorPolicy. A misspelled class name, missing dependency, constructor failure, or classpath problem can therefore start the brok

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-636
Published	2026-09-23
Last modified	2026-09-28

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

Last updated 2026-09-28 · 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
2026-09-28 15:23 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-2026-95848?

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

Is CVE-2026-95848 being exploited?

CVE-2026-95848 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-2026-95848 affect?

CVE-2026-95848 affects moquette. Severity is critical (CVSS 9.1). Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when a configured authenticator or authorizator class cannot be loaded, Server.initializeAuthenticator and Server.initializeAuthorizatorPolicy treat the failure as though no custo

How urgent is CVE-2026-95848?

Priority 51/100. Critical 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-2026-85724 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
CVE-2026-95843 HIGH 7.5 UPGRADE Moquette is a lightweight Java MQTT broker

References

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