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Vulnerability record · CVE-2026-101003 · published 28 September 2026

CVE-2026-101003: Memory buffer overflow vulnerability

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.

5.5 CVSS 4.0 Medium CWE-119 · Memory buffer overflowCWE-121 · Stack-based buffer overflow Deferred
5.5CVSS 4.0 base score, v2 5.0
—EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
28 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/cesanta/mongoose/
https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71
https://github.com/cesanta/mongoose/releases/tag/7.22
https://vuldb.com/cve/CVE-2026-101003
https://vuldb.com/submit/920005
https://vuldb.com/vuln/410873
https://vuldb.com/vuln/410873/cti

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Source: NIST National Vulnerability Database (record CVE-2026-101003), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.