CVE-2026-95842: moquette — Exploit & Fix

Description

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, SessionEventLoop.run catches only InterruptedException, and SessionEventLoopGroup does not restart a terminated loop. An MQTT command that raises an uncaught exception can terminate an event loop shared by multiple client sessions, preventing every co-located client from processing PUBLISH, SUBSCRIBE, PUBACK, and other commands. An attacker can select client IDs that map across the available loops to disrupt session processing for the entire broker. This issue is fixed in version 0.18.1.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0043

Probability of exploitation

0.36%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-248 CWE-248

Affected Products

Vendor	Product	Versions
moquette	moquette	< 0.18.1

References

Advisories & Patches

https://github.com/moquette-io/moquette/commit/86feb7c31e6fac849c465d8079d08c0e7ef01cdf https://github.com/moquette-io/moquette/pull/957 https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq

Exploits

https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq

Other References

https://github.com/moquette-io/moquette/releases/tag/v0.18.1

Frequently Asked Questions

What is CVE-2026-95842? +

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, SessionEventLoop.run catches only InterruptedException, and SessionEventLoopGroup does not restart a terminated loop. An MQTT command that raises an uncaught exception can terminate an event loop shared by multiple client sessions, preventing every co-located client from processing PUBLISH, SUBSCRIBE, PUBACK, and other commands. An attacker can select client IDs that map across the available loops to disrupt session processing for the entire broker. This issue is fixed in version 0.18.1. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-95842? +

CVE-2026-95842 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0043, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-95842? +

CVE-2026-95842 affects products from moquette, specifically: moquette. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-95842? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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