Vulnerability in Moquette
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (38.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Moquette
- Moquette-Io Moquette — versions < 0.18.1
Weakness classification (CWE)
References
- github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq (Exploit, Mitigation, Vendor Advisory)
- github.com/moquette-io/moquette/pull/957 (Patch)
- github.com/moquette-io/moquette/commit/86feb7c31e6fac849c465d8079d08c0e7ef01cdf (Patch)
- github.com/moquette-io/moquette/releases/tag/v0.18.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-95842?
- CVE-2026-95842 is a high-severity vulnerability in Moquette, classified under CWE-248. CVSS score: 7.5/10. Published 2026-09-23.
- How severe is CVE-2026-95842?
- High severity. CVSS v3 base score is 7.5 out of 10.