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Vulnerability record · CVE-2019-11779 · published 19 September 2019

CVE-2019-11779: Eclipse mosquitto vulnerability

Eclipse · Mosquitto

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.

6.5 CVSS 3.1 Medium EPSS 2.7% · top 14.4% CWE-754 · CWE-754CWE-674 · CWE-674
6.5CVSS 3.1 base score, v2 4.0
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00077.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00008.html Mailing ListThird Party Advisory
https://bugs.eclipse.org/bugs/show_bug.cgi?id=551160 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00035.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D4WMHIM64Q35NGTR6R3ILZU
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HFWQBNFTAVHPUYNGYO2TCPF
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWNVTFA2CKXERXRYPYE2YFT
https://seclists.org/bugtraq/2019/Nov/25 Mailing ListThird Party Advisory
https://usn.ubuntu.com/4137-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4570 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00077.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00008.html Mailing ListThird Party Advisory
https://bugs.eclipse.org/bugs/show_bug.cgi?id=551160 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00035.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D4WMHIM64Q35NGTR6R3ILZU
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HFWQBNFTAVHPUYNGYO2TCPF
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWNVTFA2CKXERXRYPYE2YFT
https://seclists.org/bugtraq/2019/Nov/25 Mailing ListThird Party Advisory
https://usn.ubuntu.com/4137-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4570 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-11779), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.