CVE-2026-101003CWE-119CWE-121

CVE-2026-101003

Medium · published September 28, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
39.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
6.9 · 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
EPSS
0.00462 · 39.1th percentile
Weaknesses
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer; CWE-121 · Stack-based Buffer Overflow
Published
2026-09-28T10:16Z
References (7)
https://github.com/cesanta/mongoose/ · [email protected]https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71 · [email protected]https://github.com/cesanta/mongoose/releases/tag/7.22 · [email protected]https://vuldb.com/cve/CVE-2026-101003 · [email protected]https://vuldb.com/submit/920005 · [email protected]https://vuldb.com/vuln/410873 · [email protected]https://vuldb.com/vuln/410873/cti · [email protected]
EPSS history
Timeline
  • 29 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 28 SEP 05:30Z
    Cesanta Mongoose MQTT Broker main.c fn stack-based overflow
    cvelistv5