CVE-2026-95847
Moquette client IDs can cause cross-session H2 durable-queue corruption
Description
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, H2PersistentQueue derives a session's message-map name as queue_ plus the client ID and its metadata-map name as queue_ plus the client ID plus _meta. A durable session whose client ID ends in _meta can therefore make its message map collide with another client's metadata map. The colliding sessions read and write the same H2 MVStore map with incompatible value types, which can corrupt queue head and tail data and cause message loss, misdelivery, failed queue reloads, or exposure of queued content across sessions. This issue is fixed in version 0.18.1.
INFO
Published Date :
Sept. 23, 2026, 5:17 p.m.
Last Modified :
Sept. 28, 2026, 3:23 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.
- Ensure client IDs do not end with _meta.
- Migrate affected session data carefully.
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-2026-95847.
| URL | Resource |
|---|---|
| https://github.com/moquette-io/moquette/commit/72d6c8257191d2e4b2e3aa11ab25fd09f88c6cb7 | Patch |
| https://github.com/moquette-io/moquette/pull/964 | 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-2026-95847 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-2026-95847
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-2026-95847 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-95847 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. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N 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/72d6c8257191d2e4b2e3aa11ab25fd09f88c6cb7 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/pull/964 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/releases/tag/v0.18.1 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq Types: Exploit, Mitigation, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq Types: Exploit, Mitigation, Vendor Advisory -
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, H2PersistentQueue derives a session's message-map name as queue_ plus the client ID and its metadata-map name as queue_ plus the client ID plus _meta. A durable session whose client ID ends in _meta can therefore make its message map collide with another client's metadata map. The colliding sessions read and write the same H2 MVStore map with incompatible value types, which can corrupt queue head and tail data and cause message loss, misdelivery, failed queue reloads, or exposure of queued content across sessions. 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:H/VA:L/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-99 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/95xxx/CVE-2026-95847.json">CVE-2026-95847</a> Added Reference https://github.com/moquette-io/moquette/commit/72d6c8257191d2e4b2e3aa11ab25fd09f88c6cb7 Added Reference https://github.com/moquette-io/moquette/pull/964 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 -
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-2026-95847', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-23T16:50:06.329970Z'}