CVE-2026-49329
Full vulnerability record from the local CVENow database.
Description
A flaw was found in openshift/oauth-server. The OAuth login and error page endpoints pass the unauthenticated Accept-Language header to golang.org/x/text/language.ParseAcceptLanguage() without input validation. A bypass of the CVE-2022-32149 mitigation exists: the upstream guard counts only '-' characters but the internal BCP 47 scanner aliases '_' to '-' after the guard check. An unauthenticated attacker can send a crafted Accept-Language header using '_' separators to trigger quadratic-time parsing, consuming excessive CPU and denying authentication to all cluster users.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-09-01 16:16:57.760000
Last modified
2026-10-30 05:16:59.137000
View original CVE JSON
{
"id": "CVE-2026-49329",
"sourceIdentifier": "[email protected]",
"published": "2026-09-01T16:16:57.760",
"lastModified": "2026-10-30T05:16:59.137",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in openshift/oauth-server. The OAuth login and error page endpoints pass the unauthenticated Accept-Language header to golang.org/x/text/language.ParseAcceptLanguage() without input validation. A bypass of the CVE-2022-32149 mitigation exists: the upstream guard counts only '-' characters but the internal BCP 47 scanner aliases '_' to '-' after the guard check. An unauthenticated attacker can send a crafted Accept-Language header using '_' separators to trigger quadratic-time parsing, consuming excessive CPU and denying authentication to all cluster users."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4.14",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4/ose-oauth-server-rhel8",
"cpes": [
"cpe:/a:redhat:openshift:4.14::el9"
],
"versions": [
{
"version": "1791839120",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4.15",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4/ose-oauth-server-rhel9",
"cpes": [
"cpe:/a:redhat:openshift:4.15::el9"
],
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{
"version": "1791598539",
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"versionType": "rpm",
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}
]
},
{
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"product": "Red Hat OpenShift Container Platform 4.16",
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"packageName": "openshift4/ose-oauth-server-rhel9",
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],
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{
"version": "1792883889",
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}
]
},
{
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"packageName": "openshift4/ose-oauth-server-rhel9",
"cpes": [
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],
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{
"version": "1790882323",
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}
]
},
{
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"product": "Red Hat OpenShift Container Platform 4.19",
"defaultStatus": "affected",
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"packageName": "openshift4/ose-oauth-server-rhel9",
"cpes": [
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],
"versions": [
{
"version": "1790611633",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4.20",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4/ose-oauth-server-rhel9",
"cpes": [
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],
"versions": [
{
"version": "1790702087",
"lessThan": "*",
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}
]
},
{
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"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4/ose-oauth-server-rhel9",
"cpes": [
"cpe:/a:redhat:openshift:4.21::el9"
],
"versions": [
{
"version": "1790707106",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4.22",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4/ose-oauth-server-rhel9",
"cpes": [
"cpe:/a:redhat:openshift:4.22::el9"
],
"versions": [
{
"version": "1790713150",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 5",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift5/ose-oauth-server-rhel9",
"cpes": [
"cpe:/a:redhat:openshift:5"
]
}
]
}
],
"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": "2026-09-01T17:05:19.987171Z",
"id": "CVE-2026-49329",
"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-407"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:74380",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:74383",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:74429",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:74434",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:79039",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:82785",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:82813",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:89715",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-49329",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2483248",
"source": "[email protected]"
}
]
}