CVE-2019-5432
Improper Input Validation and Buffer Over-read in mqtt-packet
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
- Record
CVE-2019-5432- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-126, CWE-125
- Updated
- 2026-11-02
CVE List No score
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
- Record
CVE-2019-5432- Weakness
- CWE-126
- Updated
- 2026-11-02
EUVDEUVD-2019-0481 No score
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
- Record
EUVD-2019-0481- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wv67-9jq7-8r69
Improper Input Validation and Buffer Over-read in mqtt-packet
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
- Record
GHSA-wv67-9jq7-8r69- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-125, CWE-126
- Updated
- 2026-11-02
OSV
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
- Record
CVE-2019-5432- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2019-5432
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
- Record
DEBIAN-CVE-2019-5432- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVGHSA-wv67-9jq7-8r69
Improper Input Validation and Buffer Over-read in mqtt-packet
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
- Record
GHSA-wv67-9jq7-8r69- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-125, CWE-126
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2019-5432
A specifically malformed MQTT Subscribe packet crashes MQTT Brokers using the mqtt-packet module versions < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2 for decoding.
- Record
UBUNTU-CVE-2019-5432- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mqtt-packetnpm |
before 3.5.1 | 3.5.1 |
mqtt-packetnpm |
4.0.0 up to 4.1.3 | 4.1.3 |
mqtt-packetnpm |
5.0.0 up to 5.6.1 | 5.6.1 |
mqtt-packetnpm |
6.0.0 up to 6.1.2 | 6.1.2 |
node-mqtt-packetDebian:12 |
before 6.0.0-2 | 6.0.0-2 |
node-mqtt-packetDebian:13 |
before 6.0.0-2 | 6.0.0-2 |
node-mqtt-packetDebian:14 |
before 6.0.0-2 | 6.0.0-2 |
node-mqtt-packetUbuntu:18.04:LTS |
All versions, plus listed versions 5.4.0-2 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-5432 is a high vulnerability (CVSS 7.5) in Mqtt-packet Project Mqtt-packet, published May 6, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.78%, the 78th percentile. Fixed in mqtt-packet 3.5.1.