CVE-2026-93007
Full vulnerability record from the local CVENow database.
Description
A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.
Severity
MEDIUM
CVSS score
5.3
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-10-29 13:17:15.890000
Last modified
2026-10-30 08:17:00.560000
View original CVE JSON
{
"id": "CVE-2026-93007",
"sourceIdentifier": "[email protected]",
"published": "2026-10-29T13:17:15.890",
"lastModified": "2026-10-30T08:17:00.560",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat Ceph Storage 9",
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"packageName": "rhceph/alloy-rhel10",
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]
},
{
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"cpes": [
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]
},
{
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"packageName": "dnsmasq",
"cpes": [
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]
},
{
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]
},
{
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},
{
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"packageName": "dnsmasq",
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},
{
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"packageName": "openshift4/ose-baremetal-runtimecfg-rhel8",
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{
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},
{
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},
{
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},
{
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"packageName": "openshift5/ose-baremetal-runtimecfg-rhel9",
"cpes": [
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},
{
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"packageName": "openshift/ose-rhel-coreos-9",
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]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenStack Platform 13 (Queens)",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "dnsmasq",
"cpes": [
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]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenStack Platform 18.0",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rhoso-operators/infra-rhel9-operator",
"cpes": [
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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:N/I:N/A:L",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "LOW"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-29T15:43:44.687454Z",
"id": "CVE-2026-93007",
"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-400"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/security/cve/CVE-2026-93007",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536076",
"source": "[email protected]"
}
]
}