Moquette deeply nested MQTT topics can cause stack exhaustion
Priority HIGH 77CWE-674Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-674.
Summary
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, Moquette does not limit the depth of topic names and topic filters before processing them through recursive CTrie insertion and matching operations. A remote client can publish or subscribe with a deeply nested topic, causing a StackOverflowError that disrupts session processing and can deny service to broker clients. This issue is fixed in version 0.18.1.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00423 36th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed moquette (moquette-io): 0.18.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| moquette-io | moquette | before 0.18.1 | 0.18.1 | Patch available | CNA |
- moquette Vendormoquette-io Affected before 0.18.1 Fixed in 0.18.1 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:* | before 0.18.1 | Vulnerable | moquette-io |
- cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:* Versions before 0.18.1 Vulnerable ·moquette-io
Remediation
- Fix · CNA moquette (moquette-io) Fixed in 0.18.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-95844
References
More moquette-io Moquette vulnerabilities
- TI-2026-63713 Moquette fails open when configured authentication or authorization classes cannot load CVSS 4.0CRITICAL 9.3
- TI-2026-63712 Moquette client IDs can cause cross-session H2 durable-queue corruption CVSS 4.0HIGH 8.8
- TI-2026-63711 Moquette publishes Last-Will messages without enforcing write authorization CVSS 4.0HIGH 8.7
- TI-2026-63708 Moquette malformed shared subscriptions can crash command processing CVSS 4.0HIGH 8.7
- TI-2026-63707 Moquette uncaught MQTT command exceptions can terminate shared session event loops CVSS 4.0HIGH 8.7
- TI-2026-58826 Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass CVSS 3.1CRITICAL 9.6
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences