CVE-2026-15711
Full vulnerability record from the local CVENow database.
Description
A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Deferred
Source identifier
Published
2026-07-14 20:16:57.177000
Last modified
2026-11-05 17:18:10.033000
View original CVE JSON
{
"id": "CVE-2026-15711",
"sourceIdentifier": "[email protected]",
"published": "2026-07-14T20:16:57.177",
"lastModified": "2026-11-05T17:18:10.033",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 10",
"defaultStatus": "affected",
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"packageName": "libsoup3",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10.2"
],
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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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}
]
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{
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{
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},
{
"vendor": "Red Hat",
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"packageName": "libsoup",
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{
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},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
"defaultStatus": "affected",
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"packageName": "libsoup",
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"cpe:/o:redhat:rhel_e4s:8.8::baseos",
"cpe:/o:redhat:rhel_tus:8.8::baseos"
],
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{
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"lessThan": "*",
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}
]
},
{
"vendor": "Red Hat",
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{
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{
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}
]
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{
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{
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{
"vendor": "Red Hat",
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"packageName": "libsoup",
"cpes": [
"cpe:/o:redhat:rhel_els:6"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 7",
"defaultStatus": "unknown",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libsoup",
"cpes": [
"cpe:/o:redhat:rhel_els:7"
]
}
]
}
],
"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:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-07-15T14:10:43.407984Z",
"id": "CVE-2026-15711",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-770"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:68234",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:68235",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:68266",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:68612",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:69108",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:69297",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:69863",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:70598",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:70599",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:71389",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-15711",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499924",
"source": "[email protected]"
},
{
"url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/515",
"source": "[email protected]"
},
{
"url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/515",
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
]
}