Improper input validation in Moquette
CVE-2026-95843
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 the shared session event loop and can deny service to other client sessions assigned to that loop. This issue is fixed in version 0.18.1.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
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 (37.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% 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/962 (Patch)
- github.com/moquette-io/moquette/commit/affdc71fdba92dc020421678970ae70518fb6da2 (Patch)
- github.com/moquette-io/moquette/releases/tag/v0.18.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-95843?
- CVE-2026-95843 is a high-severity vulnerability in Moquette, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-09-23.
- How severe is CVE-2026-95843?
- High severity. CVSS v3 base score is 7.5 out of 10.