Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-49329
Red Hat Red Hat OpenShift Container Platform 4.19 — Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpoints
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0079 54.9 —
AFFECTED
Product Versions Fixed
Red Hat OpenShift Container Platform 4.19 unspecified 1790611633
Red Hat OpenShift Container Platform 4.20 unspecified 1790702087
Red Hat OpenShift Container Platform 4.21 unspecified 1790707106
Red Hat OpenShift Container Platform 4.22 unspecified 1790713150
Red Hat OpenShift Container Platform 4 unspecified —
TIMELINE
May 29 Reserved by redhat
Sep 1 Published (CNA: redhat)
Oct 5 PATCH SHIPPED — CVE-2026-49329 (Red Hat OpenShift Container Platform 4.21). Fixed in Red Hat OpenShift Container Platform 4.21 1790707106.
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 29, 2026 | Reserved | Reserved by redhat |
| September 1, 2026 | Published | Published (CNA: redhat) |
| October 5, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-49329 (Red Hat OpenShift Container Platform 4.21). Fixed in Red Hat OpenShift Container Platform 4.21 1790707106. |
Affected
Affected products and packages — 5 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat OpenShift Container Platform 4.19 | — | — | 1790611633 |
| Red Hat | Red Hat OpenShift Container Platform 4.20 | — | — | 1790702087 |
| Red Hat | Red Hat OpenShift Container Platform 4.21 | — | — | 1790707106 |
| Red Hat | Red Hat OpenShift Container Platform 4.22 | — | — | 1790713150 |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-49329 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
