Vulnerability in Red Hat Openshift Container Platform 4
CVE-2026-49329
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.009 · change: +0.004
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-49329 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:74383 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:74429 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:74380 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:74434 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:79039 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-49329?
- CVE-2026-49329 is a high-severity vulnerability in Red Hat Openshift Container Platform 4, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-09-01.
- How severe is CVE-2026-49329?
- High severity. CVSS v3 base score is 7.5 out of 10.