CVE-2026-49329Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpoints
Updated under an hour ago ()
Does this affect you?
It affects Red Hat OpenShift Container Platform 4.18. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-407
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat OpenShift Container Platform 4.18 redhat:openshift | from 1790882323 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:74380vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:74383vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:74429vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:74434vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:79039vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-49329vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2483248issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
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