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.
Published: 2026-09-01
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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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Advisories

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History

Thu, 03 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat openshift Container Platform
Vendors & Products Redhat openshift Container Platform

Wed, 02 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
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
Weaknesses CWE-407
CPEs cpe:/a:redhat:openshift:4
Vendors & Products Redhat
Redhat openshift
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Subscriptions

Redhat Openshift Openshift Container Platform
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-18T13:32:11.841Z

Reserved: 2026-05-29T13:24:26.096Z

Link: CVE-2026-49329

cve-icon Vulnrichment

Updated: 2026-09-01T17:05:28.400Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-01T16:16:57.760

Modified: 2026-09-01T21:03:04.987

Link: CVE-2026-49329

cve-icon Redhat

Severity : Important

Publid Date: 2026-08-31T20:00:00Z

Links: CVE-2026-49329 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T16:27:43Z

Weaknesses