CVE-2025-14523
Full vulnerability record from the local CVENow database.
Description
A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.
Severity
HIGH
CVSS score
8.2
(v3.1)
Vulnerability status
Deferred
Source identifier
Published
2025-12-11 13:15:58.983000
Last modified
2026-11-04 22:17:28.697000
View original CVE JSON
{
"id": "CVE-2025-14523",
"sourceIdentifier": "[email protected]",
"published": "2025-12-11T13:15:58.983",
"lastModified": "2026-11-04T22:17:28.697",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers."
},
{
"lang": "es",
"value": "Un fallo en el manejo de encabezados HTTP de libsoup permite múltiples encabezados Host: en una solicitud y devuelve la última ocurrencia para el procesamiento del lado del servidor. Los proxies frontales comunes a menudo respetan el primer encabezado Host:, por lo que esta discrepancia puede causar confusión de vhost donde un proxy enruta una solicitud a un backend, pero el backend la interpreta como destinada a otro host. Esta discrepancia permite ataques de contrabando de solicitudes, envenenamiento de caché o eludir los controles de acceso basados en host cuando un atacante suministra encabezados Host duplicados."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
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],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 3.9,
"impactScore": 4.2
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2025-12-11T14:49:20.324130Z",
"id": "CVE-2025-14523",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-444"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:0421",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0422",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0423",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0836",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0867",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0868",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0905",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0906",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0907",
"source": "[email protected]"
},
{
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"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0909",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0911",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:0925",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:1509",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:1569",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:1570",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:1571",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:1572",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2025-14523",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2421349",
"source": "[email protected]"
},
{
"url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/472",
"source": "[email protected]"
}
]
}