{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-101003", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-09-27T10:29:14.330Z", "datePublished": "2026-09-28T05:30:14.021Z", "dateUpdated": "2026-09-28T05:30:14.021Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-09-28T05:30:14.021Z"}, "title": "Cesanta Mongoose MQTT Broker main.c fn stack-based overflow", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-121", "lang": "en", "description": "Stack-based Buffer Overflow"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-119", "lang": "en", "description": "Memory Corruption"}]}], "affected": [{"vendor": "Cesanta", "product": "Mongoose", "versions": [{"version": "7.0", "status": "affected"}, {"version": "7.1", "status": "affected"}, {"version": "7.2", "status": "affected"}, {"version": "7.3", "status": "affected"}, {"version": "7.4", "status": "affected"}, {"version": "7.5", "status": "affected"}, {"version": "7.6", "status": "affected"}, {"version": "7.7", "status": "affected"}, {"version": "7.8", "status": "affected"}, {"version": "7.9", "status": "affected"}, {"version": "7.10", "status": "affected"}, {"version": "7.11", "status": "affected"}, {"version": "7.12", "status": "affected"}, {"version": "7.13", "status": "affected"}, {"version": "7.14", "status": "affected"}, {"version": "7.15", "status": "affected"}, {"version": "7.16", "status": "affected"}, {"version": "7.17", "status": "affected"}, {"version": "7.18", "status": "affected"}, {"version": "7.19", "status": "affected"}, {"version": "7.20", "status": "affected"}, {"version": "7.21", "status": "affected"}, {"version": "7.22", "status": "unaffected"}], "cpes": ["cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"], "modules": ["MQTT Broker"]}], "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 6.9, "vectorString": "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", "baseSeverity": "MEDIUM"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 5.3, "vectorString": "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", "baseSeverity": "MEDIUM"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 5.3, "vectorString": "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", "baseSeverity": "MEDIUM"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 5, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C"}}], "timeline": [{"time": "2026-09-27T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-09-27T02:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-09-27T12:34:42.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "nemo2533 (VulDB User)", "type": "reporter"}, {"lang": "en", "value": "VulDB Vulnerability Moderation Team", "type": "coordinator"}], "references": [{"url": "https://vuldb.com/vuln/410873", "name": "VDB-410873 | Cesanta Mongoose MQTT Broker main.c fn stack-based overflow", "tags": ["vdb-entry", "technical-description"]}, {"url": "https://vuldb.com/vuln/410873/cti", "name": "VDB-410873 | CTI Indicators (IOB, IOC, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/cve/CVE-2026-101003", "name": "CVE-2026-101003 | CVE Analysis and Report", "tags": ["third-party-advisory"]}, {"url": "https://vuldb.com/submit/920005", "name": "Submit #920005 | Cesanta Mongoose 7.20 Stack Buffer Overflow", "tags": ["third-party-advisory"]}, {"url": "https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71", "tags": ["patch"]}, {"url": "https://github.com/cesanta/mongoose/releases/tag/7.22", "tags": ["patch"]}, {"url": "https://github.com/cesanta/mongoose/", "tags": ["product"]}], "tags": ["x_open-source"], "x_generator": ["VulDB PVTS v202609"]}}}

{}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"], "modules": ["MQTT Broker"], "product": "Mongoose", "vendor": "Cesanta", "versions": [{"status": "affected", "version": "7.0"}, {"status": "affected", "version": "7.1"}, {"status": "affected", "version": "7.2"}, {"status": "affected", "version": "7.3"}, {"status": "affected", "version": "7.4"}, {"status": "affected", "version": "7.5"}, {"status": "affected", "version": "7.6"}, {"status": "affected", "version": "7.7"}, {"status": "affected", "version": "7.8"}, {"status": "affected", "version": "7.9"}, {"status": "affected", "version": "7.10"}, {"status": "affected", "version": "7.11"}, {"status": "affected", "version": "7.12"}, {"status": "affected", "version": "7.13"}, {"status": "affected", "version": "7.14"}, {"status": "affected", "version": "7.15"}, {"status": "affected", "version": "7.16"}, {"status": "affected", "version": "7.17"}, {"status": "affected", "version": "7.18"}, {"status": "affected", "version": "7.19"}, {"status": "affected", "version": "7.20"}, {"status": "affected", "version": "7.21"}, {"status": "unaffected", "version": "7.22"}]}], "source": "cna@vuldb.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-101003", "lastModified": "2026-09-28T15:16:04.793", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}]}, "published": "2026-09-28T06:16:31.310", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/cesanta/mongoose/"}, {"source": "cna@vuldb.com", "url": "https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71"}, {"source": "cna@vuldb.com", "url": "https://github.com/cesanta/mongoose/releases/tag/7.22"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/cve/CVE-2026-101003"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/submit/920005"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/410873"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/410873/cti"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-121"}], "source": "cna@vuldb.com", "type": "Primary"}]}

{"bugzilla": {"description": "mongoose: mongoose: Denial of Service via stack-based buffer overflow in MQTT broker", "id": "2542308", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2542308"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in Mongoose. A remote attacker can trigger a stack-based buffer overflow by sending specially crafted network messages to the MQTT broker component. This flaw could lead to a Denial of Service (DoS) condition by crashing the application."], "name": "CVE-2026-101003", "public_date": "2026-09-28T05:30:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-101003\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-101003\nhttps://github.com/cesanta/mongoose/\nhttps://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71\nhttps://github.com/cesanta/mongoose/releases/tag/7.22\nhttps://vuldb.com/cve/CVE-2026-101003\nhttps://vuldb.com/submit/920005\nhttps://vuldb.com/vuln/410873\nhttps://vuldb.com/vuln/410873/cti"], "statement": "This vulnerability is evaluated as having Moderate impact for Red Hat because, although triggered remotely over network inputs without authentication, the scope of impact is limited to a denial of service crash and targets demonstration code rather than core platform functionality. The flawed broker logic resides within upstream tutorial files that are not deployed or enabled in supported Red Hat products. Any potential risk is confined to specialized community builds where this standalone server example is explicitly compiled and exposed to untrusted traffic.", "threat_severity": "Moderate"}

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