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

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HIGH

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

Published May 6, 2019

7.5

HIGH

CVSS 3.1

EPSS 1.59%

Description

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.

Affected products

Vendor n/a Product Mqtt-Packet Default
n/a
- Version
  Vulnerable versions: < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

n/a

Mqtt-Packet

n/a

Version	Status	Constraints
Vulnerable versions: < 3.5.1, 4.0.0 - 4.1.3, 5.0.0 - 5.6.1, 6.0.0 - 6.1.2	affected	-

mqtt-packet

npm

Introduced 0 Fixed 3.5.1
mqtt-packet

npm

Introduced 4.0.0 Fixed 4.1.3
mqtt-packet

npm

Introduced 5.0.0 Fixed 5.6.1
mqtt-packet

npm

Introduced 6.0.0 Fixed 6.1.2

Ecosystem	Package	Introduced	Fixed
npm	mqtt-packet	0	3.5.1
npm	mqtt-packet	4.0.0	4.1.3
npm	mqtt-packet	5.0.0	5.6.1
npm	mqtt-packet	6.0.0	6.1.2

Remediation

No remediation recorded yet.

Metrics

1.59% 0.01586

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.01586

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	1.59% (0.01586)	74.74th	v5 (v2026.06.15)
Jun 15, 2026	1.59% (0.01586)	72.33th	v5 (v2026.06.15)
Jul 20, 2024	0.10% (0.00096)	40.81th	v3 (v2023.03.01)
Jul 10, 2024	0.10% (0.00096)	40.78th	v3 (v2023.03.01)
Mar 7, 2023	0.10% (0.00096)	38.74th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	4.50% (0.04499)	74.08th	v2 (v2022.01.01)
Feb 3, 2022	1.84% (0.01840)	47.83th	v5 (v2026.06.15)
Jan 6, 2022	1.84% (0.01840)	47.32th	v1
Sep 1, 2021	0.42% (0.00416)	25.53th	v1
Apr 14, 2021	0.42% (0.00416)	0.00th	v1

Weaknesses (2)

CWE-125

Out-of-bounds Read

CWE-126

References (3)

https://github.com/advisories/GHSA-wv67-9jq7-8r69
Advisory
https://hackerone.com/reports/541354
x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2019-5432

Link	Providers	Tags
https://github.com/advisories/GHSA-wv67-9jq7-8r69		Advisory
https://hackerone.com/reports/541354		x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2019-5432