Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpoints (Red Hat Red Hat OpenShift Container Platform 4.14)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.70 % · percentile 53 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Awaiting Analysis
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.
Weaknesses (CWE)
- CWE-407 — Inefficient Algorithmic Complexity
References
- https://access.redhat.com/errata/RHSA-2026:74380
- https://access.redhat.com/errata/RHSA-2026:74383
- https://access.redhat.com/errata/RHSA-2026:74429
- https://access.redhat.com/errata/RHSA-2026:74434
- https://access.redhat.com/errata/RHSA-2026:79039
- https://access.redhat.com/errata/RHSA-2026:82785
- https://access.redhat.com/errata/RHSA-2026:82813
- https://access.redhat.com/errata/RHSA-2026:89715
- https://access.redhat.com/security/cve/CVE-2026-49329
- https://bugzilla.redhat.com/show_bug.cgi?id=2483248
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · secalert@redhat.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-69301
- GCVE · GCVE-0-2026-49329
Affected products
| Product | Versions |
|---|---|
| Red Hat · Red Hat OpenShift Container Platform 4.14 | unaffected 1791839120 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.15 | unaffected 1791598539 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.16 | unaffected 1792883889 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.18 | unaffected 1790882323 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.19 | unaffected 1790611633 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.20 | unaffected 1790702087 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.21 | unaffected 1790707106 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.22 | unaffected 1790713150 < * |
| Red Hat · Red Hat OpenShift Container Platform 5 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |