CVE-2026-95843
Moquette malformed shared subscriptions can crash command processing
Description
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.
INFO
Published Date :
Sept. 23, 2026, 5:17 p.m.
Last Modified :
Sept. 25, 2026, 1:34 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Moquette to version 0.18.1 or later.
- Apply vendor patches if available.
- Monitor system for stability.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-95843.
| URL | Resource |
|---|---|
| https://github.com/moquette-io/moquette/commit/affdc71fdba92dc020421678970ae70518fb6da2 | Patch |
| https://github.com/moquette-io/moquette/pull/962 | Patch |
| https://github.com/moquette-io/moquette/releases/tag/v0.18.1 | Release Notes |
| https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq | Exploit Mitigation Vendor Advisory |
| https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-95843 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-95843
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-95843 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-95843 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:* versions up to (excluding) 0.18.1 Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/commit/affdc71fdba92dc020421678970ae70518fb6da2 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/pull/962 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/releases/tag/v0.18.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq Types: Exploit, Mitigation, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 23, 2026
Action Type Old Value New Value Added Reference https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq Added SSVC {'id': 'CVE-2026-95843', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-23T17:57:47.160479Z'} -
New CVE Received by [email protected]
Sep. 23, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-20 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/95xxx/CVE-2026-95843.json">CVE-2026-95843</a> Added Reference https://github.com/moquette-io/moquette/commit/affdc71fdba92dc020421678970ae70518fb6da2 Added Reference https://github.com/moquette-io/moquette/pull/962 Added Reference https://github.com/moquette-io/moquette/releases/tag/v0.18.1 Added Reference https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq