All vulnerabilities
CVE-2026-101003

Cesanta Mongoose MQTT Broker main.c fn stack-based overflow

Cesanta Mongoose
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.46%Chance of exploitation activity in the next 30 days, higher than 39% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published28 Sep 2026Updated 1 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

A weakness has been identified in Cesanta Mongoose up to 7.21. Affected by this vulnerability is the function fn of the file tutorials/mqtt/mqtt-server/main.c of the component MQTT Broker. Executing a manipulation can lead to stack-based buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.22 addresses this issue. This patch is called a9df523f76f43a38bd53b4232b9cfd4c16869e71. Upgrading the affected component is advised.

Text from CVE List

Affected versions 23

  • Mongooseaffected: 7.0CVE List
  • Mongooseaffected: 7.1CVE List
  • Mongooseaffected: 7.2CVE List
  • Mongooseaffected: 7.3CVE List
  • Mongooseaffected: 7.4CVE List
  • Mongooseaffected: 7.5CVE List
  • Mongooseaffected: 7.6CVE List
  • Mongooseaffected: 7.7CVE List
  • Mongooseaffected: 7.8CVE List
  • Mongooseaffected: 7.9CVE List
  • Mongooseaffected: 7.10CVE List
  • Mongooseaffected: 7.11CVE List
  • Mongooseaffected: 7.12CVE List
  • Mongooseaffected: 7.13CVE List
  • Mongooseaffected: 7.14CVE List
  • Mongooseaffected: 7.15CVE List
  • Mongooseaffected: 7.16CVE List
  • Mongooseaffected: 7.17CVE List
  • Mongooseaffected: 7.18CVE List
  • Mongooseaffected: 7.19CVE List
  • Mongooseaffected: 7.20CVE List
  • Mongooseaffected: 7.21CVE List
  • Mongooseunaffected: 7.22CVE List

References 7