{"id":"CVE-2026-101003","revision":null,"records":[{"revision":"c862b260090747e2beb3bda40e3da9ce","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-101003","aliases":[],"title":"Cesanta Mongoose MQTT Broker main.c fn stack-based overflow","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.","state":0,"publishedAt":"2026-09-28T05:30:14.021+00:00","modifiedAt":"2026-10-01T14:06:48.183+00:00","affected":[{"ecosystem":"Vendor product","name":"Mongoose","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Cesanta\",\n                    \"product\": \"Mongoose\",\n                    \"versions\": [\n                        {\n                            \"version\": \"7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.14\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.20\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.21\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.22\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"modules\": [\n                        \"MQTT Broker\"\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":6.9,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","score":5.3,"severity":"MEDIUM"},{"system":"CVSS 3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","score":5.3,"severity":"MEDIUM"},{"system":"CVSS 2.0","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C","score":5,"severity":null}],"references":["https://vuldb.com/vuln/410873","https://vuldb.com/vuln/410873/cti","https://vuldb.com/cve/CVE-2026-101003","https://vuldb.com/submit/920005","https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71","https://github.com/cesanta/mongoose/releases/tag/7.22","https://github.com/cesanta/mongoose/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-101003","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-101003","identifiers":["CVE-2026-101003"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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