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CVE-2019-11779

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE...

6.5 MediumFix available

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.74%Up 0.5 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Record
CVE-2019-11779
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness
CWE-754, CWE-674
Updated
2026-11-02
CVE List No score

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Record
CVE-2019-11779
Weakness
CWE-754
Updated
2026-11-02
EUVDEUVD-2019-3446 No score

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Record
EUVD-2019-3446
Updated
2026-11-03
GitHub AdvisoriesGHSA-wjwr-9f4q-q8h8 No score

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE...

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Record
GHSA-wjwr-9f4q-q8h8
Weakness
CWE-674
Updated
2026-11-02
OSVALPINE-CVE-2019-11779 6.5

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Record
ALPINE-CVE-2019-11779
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVBELL-CVE-2019-11779 6.5

CVE-2019-11779 does not affect BellSoft software

Record
BELL-CVE-2019-11779
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 6 moreShow less
OSV 6.5

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Record
CVE-2019-11779
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2019-11779 6.5

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Record
DEBIAN-CVE-2019-11779
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2019-0345 No score

Updated mosquitto packages fix security vulnerability

Updated mosquitto packages fix security vulnerability:

A vulnerability was discovered in mosquitto, allowing a malicious MQTT client to cause a denial of service (stack overflow and daemon crash), by sending a specially crafted SUBSCRIBE packet containing a topic with a extremely deep hierarchy (CVE-2019-11779).

Record
MGASA-2019-0345
Updated
2026-11-02
OSVopenSUSE-SU-2019:2206-1 No score

Security update for mosquitto

This update for mosquitto fixes the following issues:

  • CVE-2019-11779: Fixed insufficient parsing of SUBSCRIBE packets that could lead to a stack overflow (bsc#1151494).
Record
openSUSE-SU-2019:2206-1
Updated
2026-11-02
OSVopenSUSE-SU-2019:2247-1 No score

Security update for mosquitto

This update for mosquitto fixes the following issues:

  • CVE-2019-11779: Fixed insufficient parsing of SUBSCRIBE packets that could lead to a stack overflow (bsc#1151494).

This update was imported from the openSUSE:Leap:15.1:Update update project.

Record
openSUSE-SU-2019:2247-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11057-1 No score

libmosquitto1-2.0.11-1.2 on GA media

These are all security issues fixed in the libmosquitto1-2.0.11-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11057-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mosquitto
Alpine:v3.10
 1.5 up to 1.6.3-r1
1.6.3-r1
mosquitto
Alpine:v3.11
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.12
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.13
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.14
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.15
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.16
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.17
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.18
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.19
 1.5 up to 1.6.7-r0
1.6.7-r0
Show 14 moreShow less
Affected packages
PackageAffectedFixed
mosquitto
Alpine:v3.20
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.21
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.22
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.23
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.24
 1.5 up to 1.6.7-r0
1.6.7-r0
mosquitto
Alpine:v3.9
 1.5 up to 1.5.6-r1
1.5.6-r1
mosquitto
Debian:12
 before 1.6.6-1
1.6.6-1
mosquitto
Debian:13
 before 1.6.6-1
1.6.6-1
mosquitto
Debian:14
 before 1.6.6-1
1.6.6-1
mosquitto
Debian:8
From an advisory covering 4 CVEs
 before 1.3.4-2+deb8u4, plus listed versions
1.3.4-21.3.4-2+deb8u11.3.4-2+deb8u21.3.4-2+deb8u3
1.3.4-2+deb8u4
mosquitto
Debian:10
 before 1.5.7-1+deb10u1, plus listed versions
1.5.7-1
1.5.7-1+deb10u1
mosquitto
Mageia:7
 before 1.6.6-1.mga7
1.6.6-1.mga7
mosquitto
openSUSE:Leap 15.1
 before 1.5.7-lp151.2.3.1
1.5.7-lp151.2.3.1
mosquitto
SUSE:Package Hub 15 SP1
 before 1.5.7-bp151.3.3.1
1.5.7-bp151.3.3.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-11779 is a medium vulnerability (CVSS 6.5) in Eclipse Mosquitto, published September 19, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.74%, the 86th percentile. Fixed in mosquitto 1.6.3-r1.

References

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