CVE-2026-46579
Openshift/router: openshift/router: mtls client certificate spoofing via unstripped x-ssl-client headers on http frontend
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 |
| Vendor | red hat |
| Product | red hat openshift container platform 4.13 |
| Published | May 29, 2026 |
| Last Updated | Jul 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat OpenShift Container Platform 4.13
All versions affected Red Hat / Red Hat OpenShift Container Platform 4.18
All versions affected Red Hat / Red Hat OpenShift Container Platform 4.19
All versions affected Red Hat / Red Hat OpenShift Container Platform 4.20
All versions affected Red Hat / Red Hat OpenShift Container Platform 4.21
All versions affected Red Hat / Red Hat OpenShift Container Platform 4.22
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:27009 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:27044 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:27063 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37580 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40022 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40828 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-46579 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2483181 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46579.json
Credits
This issue was discovered by Ricardo Pchevuzinske Katz (Red Hat).