CVE-2026-49329

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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."}], "id": "CVE-2026-49329", "lastModified": "2026-11-13T13:18:23.380", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49329", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-01T17:05:19.987171Z", "version": "2.0.3"}}]}, "published": "2026-09-01T16:16:57.760", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:74380"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:74383"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:74429"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:74434"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:79039"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82785"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82813"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:89715"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95746"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:96283"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-49329"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2483248"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank tonghuaroot for reporting this issue.", "bugzilla": {"description": "openshift/oauth-server: openshift/oauth-server: Quadratic-time DoS via Accept-Language header underscore bypass on unauthenticated login endpoints", "id": "2483248", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2483248"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-407", "details": ["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."], "mitigation": {"lang": "en:us", "value": "Apply a call-site guard in getPreferredLang() that counts both '-' and '_' separators and short-circuits to the English fallback when the total exceeds a small ceiling (e.g., 32). Alternatively, limit Accept-Language header size at a reverse proxy or WAF layer to 4 KiB or less."}, "name": "CVE-2026-49329", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-oauth-server-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-oauth-server-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-31T20:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-49329\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-49329"], "statement": "This is an Important denial of service vulnerability in OpenShift Container Platform. Unauthenticated remote attackers can exploit it by sending oversized Accept-Language headers to the OAuth server's login endpoints. This triggers a quadratic-time parsing process, consuming excessive CPU resources and potentially disrupting service availability. The HAProxy ingress router, configured for TLS passthrough on OAuth routes, does not limit HTTP header sizes, allowing the malicious headers to reach the vulnerable component.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "Red Hat OpenShift Container Platform 4", "source": "cna", "vendor": "Red Hat"}, "product": "openshift_container_platform", "vendor": "redhat"}], "created": "2026-09-02T00:00:06.749349+00:00", "updated": "2026-09-03T16:27:43.179032+00:00", "vendors": ["redhat", "redhat$PRODUCT$openshift_container_platform"]}