CVE-2026-49329 Denial of service in Red Hat OpenShift Container Platform 4.14
An unauthenticated attacker can cause denial of service in OpenShift by sending crafted Accept-Language headers that trigger excessive CPU usage.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49329?
CVE-2026-49329 is a high-severity denial of service vulnerability in Red Hat OpenShift Container Platform 4.14, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-407
Which versions are affected by CVE-2026-49329?
How do I fix CVE-2026-49329?
No fix has been published for CVE-2026-49329 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-49329 being exploited?
There is no known exploitation of CVE-2026-49329 in the wild and no public exploit code.
Sources
Also known as GHSA-2mr2-j2wm-v93x.