CVE-2026-101003 (GCVE-0-2026-101003)
Vulnerability from cvelistv5 – Published: 2026-09-28 05:30 – Updated: 2026-09-28 05:30 X_Open Source
VLAI
EPSS
VEX
Title
Cesanta Mongoose MQTT Broker main.c fn stack-based overflow
Summary
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.
Severity
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/410873 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/410873/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-101003 | third-party-advisory |
| https://vuldb.com/submit/920005 | third-party-advisory |
| https://github.com/cesanta/mongoose/commit/a9df52… | patch |
| https://github.com/cesanta/mongoose/releases/tag/7.22 | patch |
| https://github.com/cesanta/mongoose/ | product |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cesanta | Mongoose |
Affected:
7.0
Affected: 7.1 Affected: 7.2 Affected: 7.3 Affected: 7.4 Affected: 7.5 Affected: 7.6 Affected: 7.7 Affected: 7.8 Affected: 7.9 Affected: 7.10 Affected: 7.11 Affected: 7.12 Affected: 7.13 Affected: 7.14 Affected: 7.15 Affected: 7.16 Affected: 7.17 Affected: 7.18 Affected: 7.19 Affected: 7.20 Affected: 7.21 Unaffected: 7.22 cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:* |
{
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"cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"
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],
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{
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{
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{
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{
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{
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{
"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"
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{
"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",
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},
{
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"credits": [
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"lang": "en",
"type": "reporter",
"value": "nemo2533 (VulDB User)"
},
{
"lang": "en",
"type": "coordinator",
"value": "VulDB Vulnerability Moderation Team"
}
],
"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": [
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"providerMetadata": {
"dateUpdated": "2026-09-28T05:30:14.021Z",
"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"shortName": "VulDB"
},
"references": [
{
"name": "VDB-410873 | Cesanta Mongoose MQTT Broker main.c fn stack-based overflow",
"tags": [
"vdb-entry",
"technical-description"
],
"url": "https://vuldb.com/vuln/410873"
},
{
"name": "VDB-410873 | CTI Indicators (IOB, IOC, IOA)",
"tags": [
"signature",
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},
{
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},
{
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},
{
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"url": "https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71"
},
{
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"url": "https://github.com/cesanta/mongoose/releases/tag/7.22"
},
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"url": "https://github.com/cesanta/mongoose/"
}
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"time": "2026-09-27T00:00:00.000Z",
"value": "Advisory disclosed"
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"time": "2026-09-27T02:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-09-27T12:34:42.000Z",
"value": "VulDB entry last update"
}
],
"title": "Cesanta Mongoose MQTT Broker main.c fn stack-based overflow",
"x_generator": [
"VulDB PVTS v202609"
]
}
},
"cveMetadata": {
"assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"assignerShortName": "VulDB",
"cveId": "CVE-2026-101003",
"datePublished": "2026-09-28T05:30:14.021Z",
"dateReserved": "2026-09-27T10:29:14.330Z",
"dateUpdated": "2026-09-28T05:30:14.021Z",
"state": "PUBLISHED"
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"status": "affected",
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"status": "affected",
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"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": "2026-09-28T06:16:31.310",
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"baseScore": 5.0,
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"scope": "UNCHANGED",
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"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
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"privilegesRequired": "NONE",
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"references": [
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"url": "https://github.com/cesanta/mongoose/"
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{
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},
{
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{
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},
{
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},
"redhat_vex": {
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"cve": "CVE-2026-101003",
"id": "CVE-2026-101003",
"initial_release_date": "2026-09-28T05:30:14.021000+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "mongoose: mongoose: Denial of Service via stack-based buffer overflow in MQTT broker",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101003.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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