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Vendor Workaround
Until an OpenShift update containing the vendor fix is available, place an external WAF or load balancer that terminates TLS in front of the OAuth endpoint. Configure it to reject requests with an Accept-Language header larger than 4 KiB or with more than 32 combined - and _ separators. Rate-limit unauthenticated requests to the OAuth login and error endpoints as an additional defense. The proxy must re-establish TLS to the existing OAuth route, preserve the OAuth hostname/SNI, and validate the backend certificate. Do not disable TLS verification or expose the OAuth service directly. If an external TLS-terminating control cannot be deployed, there is no supported OpenShift router-only mitigation while the OAuth route remains TLS passthrough. Restricting access to the OAuth endpoint to trusted networks can reduce exposure but may affect user access. Upgrade to the first OpenShift release containing the fix as soon as it is available.
Tracking
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Thu, 03 Sep 2026 16:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Redhat openshift Container Platform
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| Vendors & Products |
Redhat openshift Container Platform
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Wed, 02 Sep 2026 00:15:00 +0000
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| Metrics |
threat_severity
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threat_severity
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Tue, 01 Sep 2026 22:00:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpoints | |
| First Time appeared |
Redhat
Redhat openshift |
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| Weaknesses | CWE-407 | |
| CPEs | cpe:/a:redhat:openshift:4 | |
| Vendors & Products |
Redhat
Redhat openshift |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-09-18T13:32:11.841Z
Reserved: 2026-05-29T13:24:26.096Z
Link: CVE-2026-49329
Updated: 2026-09-01T17:05:28.400Z
Status : Awaiting Analysis
Published: 2026-09-01T16:16:57.760
Modified: 2026-09-01T21:03:04.987
Link: CVE-2026-49329
OpenCVE Enrichment
Updated: 2026-09-03T16:27:43Z