FKIE_CVE-2026-12200
Vulnerability from fkie_nvd - Published: 2026-06-15 01:16 - Updated: 2026-07-24 12:10
Severity
Summary
A security vulnerability has been detected in Ritlabs TinyWeb Server up to 1.94 on Win32. This impacts an unknown function in the library libeay32.dll.html of the component Header Handler. The manipulation of the argument Authorization leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"cpes": [
"cpe:2.3:a:ritlabs:tinyweb_server:*:*:*:*:*:*:*:*"
],
"modules": [
"Header Handler"
],
"product": "TinyWeb Server",
"vendor": "Ritlabs",
"versions": [
{
"status": "affected",
"version": "1.0"
},
{
"status": "affected",
"version": "1.1"
},
{
"status": "affected",
"version": "1.2"
},
{
"status": "affected",
"version": "1.3"
},
{
"status": "affected",
"version": "1.4"
},
{
"status": "affected",
"version": "1.5"
},
{
"status": "affected",
"version": "1.6"
},
{
"status": "affected",
"version": "1.7"
},
{
"status": "affected",
"version": "1.8"
},
{
"status": "affected",
"version": "1.9"
},
{
"status": "affected",
"version": "1.10"
},
{
"status": "affected",
"version": "1.11"
},
{
"status": "affected",
"version": "1.12"
},
{
"status": "affected",
"version": "1.13"
},
{
"status": "affected",
"version": "1.14"
},
{
"status": "affected",
"version": "1.15"
},
{
"status": "affected",
"version": "1.16"
},
{
"status": "affected",
"version": "1.17"
},
{
"status": "affected",
"version": "1.18"
},
{
"status": "affected",
"version": "1.19"
},
{
"status": "affected",
"version": "1.20"
},
{
"status": "affected",
"version": "1.21"
},
{
"status": "affected",
"version": "1.22"
},
{
"status": "affected",
"version": "1.23"
},
{
"status": "affected",
"version": "1.24"
},
{
"status": "affected",
"version": "1.25"
},
{
"status": "affected",
"version": "1.26"
},
{
"status": "affected",
"version": "1.27"
},
{
"status": "affected",
"version": "1.28"
},
{
"status": "affected",
"version": "1.29"
},
{
"status": "affected",
"version": "1.30"
},
{
"status": "affected",
"version": "1.31"
},
{
"status": "affected",
"version": "1.32"
},
{
"status": "affected",
"version": "1.33"
},
{
"status": "affected",
"version": "1.34"
},
{
"status": "affected",
"version": "1.35"
},
{
"status": "affected",
"version": "1.36"
},
{
"status": "affected",
"version": "1.37"
},
{
"status": "affected",
"version": "1.38"
},
{
"status": "affected",
"version": "1.39"
},
{
"status": "affected",
"version": "1.40"
},
{
"status": "affected",
"version": "1.41"
},
{
"status": "affected",
"version": "1.42"
},
{
"status": "affected",
"version": "1.43"
},
{
"status": "affected",
"version": "1.44"
},
{
"status": "affected",
"version": "1.45"
},
{
"status": "affected",
"version": "1.46"
},
{
"status": "affected",
"version": "1.47"
},
{
"status": "affected",
"version": "1.48"
},
{
"status": "affected",
"version": "1.49"
},
{
"status": "affected",
"version": "1.50"
},
{
"status": "affected",
"version": "1.51"
},
{
"status": "affected",
"version": "1.52"
},
{
"status": "affected",
"version": "1.53"
},
{
"status": "affected",
"version": "1.54"
},
{
"status": "affected",
"version": "1.55"
},
{
"status": "affected",
"version": "1.56"
},
{
"status": "affected",
"version": "1.57"
},
{
"status": "affected",
"version": "1.58"
},
{
"status": "affected",
"version": "1.59"
},
{
"status": "affected",
"version": "1.60"
},
{
"status": "affected",
"version": "1.61"
},
{
"status": "affected",
"version": "1.62"
},
{
"status": "affected",
"version": "1.63"
},
{
"status": "affected",
"version": "1.64"
},
{
"status": "affected",
"version": "1.65"
},
{
"status": "affected",
"version": "1.66"
},
{
"status": "affected",
"version": "1.67"
},
{
"status": "affected",
"version": "1.68"
},
{
"status": "affected",
"version": "1.69"
},
{
"status": "affected",
"version": "1.70"
},
{
"status": "affected",
"version": "1.71"
},
{
"status": "affected",
"version": "1.72"
},
{
"status": "affected",
"version": "1.73"
},
{
"status": "affected",
"version": "1.74"
},
{
"status": "affected",
"version": "1.75"
},
{
"status": "affected",
"version": "1.76"
},
{
"status": "affected",
"version": "1.77"
},
{
"status": "affected",
"version": "1.78"
},
{
"status": "affected",
"version": "1.79"
},
{
"status": "affected",
"version": "1.80"
},
{
"status": "affected",
"version": "1.81"
},
{
"status": "affected",
"version": "1.82"
},
{
"status": "affected",
"version": "1.83"
},
{
"status": "affected",
"version": "1.84"
},
{
"status": "affected",
"version": "1.85"
},
{
"status": "affected",
"version": "1.86"
},
{
"status": "affected",
"version": "1.87"
},
{
"status": "affected",
"version": "1.88"
},
{
"status": "affected",
"version": "1.89"
},
{
"status": "affected",
"version": "1.90"
},
{
"status": "affected",
"version": "1.91"
},
{
"status": "affected",
"version": "1.92"
},
{
"status": "affected",
"version": "1.93"
},
{
"status": "affected",
"version": "1.94"
}
]
}
],
"source": "cna@vuldb.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A security vulnerability has been detected in Ritlabs TinyWeb Server up to 1.94 on Win32. This impacts an unknown function in the library libeay32.dll.html of the component Header Handler. The manipulation of the argument Authorization leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way."
},
{
"lang": "es",
"value": "Una vulnerabilidad de seguridad ha sido detectada en Ritlabs TinyWeb Server hasta 1.94 en Win32. Esto afecta a una funci\u00f3n desconocida en la biblioteca libeay32.dll.html del componente Gestor de Encabezados. La manipulaci\u00f3n del argumento Autorizaci\u00f3n conduce a un desbordamiento de b\u00fafer basado en pila. El ataque puede ser iniciado remotamente. El exploit ha sido divulgado p\u00fablicamente y puede ser utilizado. El proveedor fue contactado tempranamente sobre esta divulgaci\u00f3n pero no respondi\u00f3 de ninguna manera."
}
],
"id": "CVE-2026-12200",
"lastModified": "2026-07-24T12:10:00.210",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 7.5,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 6.4,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "cna@vuldb.com",
"type": "Secondary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.4,
"source": "cna@vuldb.com",
"type": "Secondary"
}
],
"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:L/VI:L/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": "LOW",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "cna@vuldb.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-12200",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-15T21:49:59.205529Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-06-15T01:16:24.667",
"references": [
{
"source": "cna@vuldb.com",
"url": "https://nathan2.com/posts/tinyweb/"
},
{
"source": "cna@vuldb.com",
"url": "https://vuldb.com/cve/CVE-2026-12200"
},
{
"source": "cna@vuldb.com",
"url": "https://vuldb.com/submit/829894"
},
{
"source": "cna@vuldb.com",
"url": "https://vuldb.com/vuln/370842"
},
{
"source": "cna@vuldb.com",
"url": "https://vuldb.com/vuln/370842/cti"
}
],
"sourceIdentifier": "cna@vuldb.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-119"
},
{
"lang": "en",
"value": "CWE-121"
}
],
"source": "cna@vuldb.com",
"type": "Secondary"
}
]
}
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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.
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.
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