CVE-2026-95843: Moquette is a lightweight Java MQTT broker

Q: How do I fix CVE-2026-95843?

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

Q: Is CVE-2026-95843 being exploited?

CVE-2026-95843 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-2026-95843 affect?

CVE-2026-95843 affects moquette. Severity is high (CVSS 7.5). Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.subscribe parses a shared-subscription filter through SharedSubscriptionUtils.extractShareName before validating the complete $share/{shareName}/{topicFilter} structure

Q: How urgent is CVE-2026-95843?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-95843 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.subscribe parses a shared-subscription filter through SharedSubscriptionUtils.extractShareName before validating the complete $share/{shareName}/{topicFilter} structure. A remote client can send a filter such as $share/grp without a topic-filter portion, causing a StringIndexOutOfBoundsException while calculating the share name. The exception terminates command handling on th

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	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-20
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-2026-95843?

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

Is CVE-2026-95843 being exploited?

CVE-2026-95843 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-2026-95843 affect?

CVE-2026-95843 affects moquette. Severity is high (CVSS 7.5). Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.subscribe parses a shared-subscription filter through SharedSubscriptionUtils.extractShareName before validating the complete $share/{shareName}/{topicFilter} structure

How urgent is CVE-2026-95843?

Priority 45/100. 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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