CVE-2026-49329
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.
How to fix
- access.redhat.com/errata/RHSA-2026:74380
- access.redhat.com/errata/RHSA-2026:74383
- access.redhat.com/errata/RHSA-2026:74429
- access.redhat.com/errata/RHSA-2026:74434
- access.redhat.com/errata/RHSA-2026:79039
- access.redhat.com/errata/RHSA-2026:82785
- access.redhat.com/errata/RHSA-2026:82813
- access.redhat.com/errata/RHSA-2026:89715
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openshift 4.14 | No range specified | — |
| openshift 4.15 | No range specified | — |
| openshift 4.16 | No range specified | — |
| openshift 4.18 | No range specified | — |
| openshift 4.19 | No range specified | — |
| openshift 4.20 | No range specified | — |
| openshift 4.21 | No range specified | — |
| openshift 4.22 | No range specified | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.