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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat OpenShift Container Platform 4.13 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.14 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.15 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.16 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.17 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.18 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.19 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.20 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.21 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.22 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
References
- RHSA-2026:74380 vendor-advisory
- RHSA-2026:74383 vendor-advisory
- RHSA-2026:74429 vendor-advisory
- RHSA-2026:74434 vendor-advisory
- RHSA-2026:79039 vendor-advisory
- RHSA-2026:82785 vendor-advisory
- RHSA-2026:82813 vendor-advisory
- RHSA-2026:89715 vendor-advisory
- RHSA-2026:95746 vendor-advisory
- RHSA-2026:96283 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-49329 vdb-entry
- RHBZ#2483248 issue-tracking