FKIE_CVE-2026-3784
Vulnerability from fkie_nvd - Published: 2026-03-11 11:16 - Updated: 2026-06-17 10:44
Severity
Summary
curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a
server, even if the new request uses different credentials for the HTTP proxy.
The proper behavior is to create or use a separate connection.
References
| URL | Tags | ||
|---|---|---|---|
| 2499f714-1537-4658-8207-48ae4bb9eae9 | https://curl.se/docs/CVE-2026-3784.html | Patch, Vendor Advisory | |
| 2499f714-1537-4658-8207-48ae4bb9eae9 | https://curl.se/docs/CVE-2026-3784.json | Vendor Advisory | |
| 2499f714-1537-4658-8207-48ae4bb9eae9 | https://hackerone.com/reports/3584903 | Exploit, Issue Tracking, Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | http://www.openwall.com/lists/oss-security/2026/03/11/3 | Mailing List, Third Party Advisory | |
| 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | https://cert-portal.siemens.com/productcert/html/ssa-253495.html |
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"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.2",
"status": "affected",
"version": "7.15.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.1",
"status": "affected",
"version": "7.15.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.0",
"status": "affected",
"version": "7.15.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.14.1",
"status": "affected",
"version": "7.14.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.14.0",
"status": "affected",
"version": "7.14.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.2",
"status": "affected",
"version": "7.13.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.1",
"status": "affected",
"version": "7.13.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.0",
"status": "affected",
"version": "7.13.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.3",
"status": "affected",
"version": "7.12.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.2",
"status": "affected",
"version": "7.12.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.1",
"status": "affected",
"version": "7.12.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.0",
"status": "affected",
"version": "7.12.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.2",
"status": "affected",
"version": "7.11.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.1",
"status": "affected",
"version": "7.11.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.0",
"status": "affected",
"version": "7.11.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.8",
"status": "affected",
"version": "7.10.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.7",
"status": "affected",
"version": "7.10.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.6",
"status": "affected",
"version": "7.10.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.5",
"status": "affected",
"version": "7.10.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.4",
"status": "affected",
"version": "7.10.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.3",
"status": "affected",
"version": "7.10.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.2",
"status": "affected",
"version": "7.10.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.1",
"status": "affected",
"version": "7.10.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10",
"status": "affected",
"version": "7.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9.8",
"status": "affected",
"version": "7.9.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9.7",
"status": "affected",
"version": "7.9.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9.6",
"status": "affected",
"version": "7.9.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9.5",
"status": "affected",
"version": "7.9.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9.4",
"status": "affected",
"version": "7.9.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9.3",
"status": "affected",
"version": "7.9.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9.2",
"status": "affected",
"version": "7.9.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9.1",
"status": "affected",
"version": "7.9.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.9",
"status": "affected",
"version": "7.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.8.1",
"status": "affected",
"version": "7.8.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.8",
"status": "affected",
"version": "7.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.7.3",
"status": "affected",
"version": "7.7.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.7.2",
"status": "affected",
"version": "7.7.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.7.1",
"status": "affected",
"version": "7.7.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.7",
"status": "affected",
"version": "7.7",
"versionType": "semver"
}
]
}
],
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
"affectedData": [
{
"defaultStatus": "unknown",
"product": "RUGGEDCOM RST2428P",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V4.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "94E54714-769C-4910-9044-7BFF8F9F94F0",
"versionEndExcluding": "8.18.0",
"versionStartIncluding": "7.7",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a\nserver, even if the new request uses different credentials for the HTTP proxy.\nThe proper behavior is to create or use a separate connection."
},
{
"lang": "es",
"value": "curl reutilizar\u00eda err\u00f3neamente una conexi\u00f3n proxy HTTP existente haciendo CONNECT a un servidor, incluso si la nueva solicitud utiliza credenciales diferentes para el proxy HTTP. El comportamiento adecuado es crear o usar una conexi\u00f3n separada."
}
],
"id": "CVE-2026-3784",
"lastModified": "2026-06-17T10:44:12.767",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"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:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 2.5,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-3784",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-11T15:48:38.785522Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-03-11T11:16:00.437",
"references": [
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://curl.se/docs/CVE-2026-3784.html"
},
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"tags": [
"Vendor Advisory"
],
"url": "https://curl.se/docs/CVE-2026-3784.json"
},
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"tags": [
"Exploit",
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/3584903"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://www.openwall.com/lists/oss-security/2026/03/11/3"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-253495.html"
}
],
"sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-305"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"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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