What’s Vulnerable › Vulnerabilities
CVE-2026-46579: Openshift/router: openshift/router: mtls client certificate spoofing via unstripped x-ssl-client headers on http frontend
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-29 · updated 2026-09-10
- Weakness: CWE-287
Description
A flaw was found in the OpenShift Router. When a Route has `insecureEdgeTerminationPolicy` set to Allow, the HTTP frontend does not remove `X-SSL-Client-*` headers from incoming requests. This allows an unauthenticated attacker to send plain HTTP requests with crafted `X-SSL-Client-*` headers. As a result, backends relying on these headers for mutual TLS (Transport Layer Security) authentication can be bypassed, enabling the attacker to impersonate client certificate identities.
Affected products
- Red Hat OpenShift Container Platform 4.18: 4.0
- RedHat Openshift Router: all versions
References
- https://access.redhat.com/errata/RHSA-2026:27009
- https://access.redhat.com/errata/RHSA-2026:27044
- https://access.redhat.com/errata/RHSA-2026:27063
- https://access.redhat.com/errata/RHSA-2026:37580
- https://access.redhat.com/errata/RHSA-2026:40022
- https://access.redhat.com/errata/RHSA-2026:40828
- https://access.redhat.com/errata/RHSA-2026:43227
- https://access.redhat.com/errata/RHSA-2026:43253
- https://access.redhat.com/errata/RHSA-2026:43331
- https://access.redhat.com/errata/RHSA-2026:47703
- https://access.redhat.com/errata/RHSA-2026:47728
- https://access.redhat.com/security/cve/CVE-2026-46579
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