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Fencer Vulns
high 7.4

CVE-2026-46579 json

Openshift/router: openshift/router: mtls client certificate spoofing via unstripped x-ssl-client headers on http frontend

published 2026-05-29 5 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-33274

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat OpenShift Container Platform 4.12 1784323891
  • Red Hat Red Hat OpenShift Container Platform 4.13 1784056734
  • Red Hat Red Hat OpenShift Container Platform 4.14 1784587649
  • Red Hat Red Hat OpenShift Container Platform 4.15 1784580646
  • Red Hat Red Hat OpenShift Container Platform 4.16 1784331638
  • Red Hat Red Hat OpenShift Container Platform 4.17 1784321465
  • Red Hat Red Hat OpenShift Container Platform 4.18 1783719377
  • Red Hat Red Hat OpenShift Container Platform 4.19 1783445642
  • Red Hat Red Hat OpenShift Container Platform 4.20 1781639027
  • Red Hat Red Hat OpenShift Container Platform 4.21 1781552170
  • Red Hat Red Hat OpenShift Container Platform 4.22 1781643967

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-46579 updated cvss 7.4

openshift/router: openshift/router: mTLS client certificate spoofing via unstripped X-SSL-Client headers on HTTP frontend

  • Red Hat OpenShift Container Platform 4.12 openshift4/ose-haproxy-router 1784323891
    fixed: vendor fix RHSA-2026:47703
  • Red Hat OpenShift Container Platform 4.13 openshift4/ose-haproxy-router 1784056734
    fixed: vendor fix RHSA-2026:40022
  • Red Hat OpenShift Container Platform 4.14 openshift4/ose-haproxy-router 1784587649
    fixed: vendor fix RHSA-2026:43253
  • Red Hat OpenShift Container Platform 4.15 openshift4/ose-haproxy-router 1784580646
    fixed: vendor fix RHSA-2026:43227
  • Red Hat OpenShift Container Platform 4.16 openshift4/ose-haproxy-router-rhel9 1784331638
    fixed: vendor fix RHSA-2026:43331
  • Red Hat OpenShift Container Platform 4.17 openshift4/ose-haproxy-router-rhel9 1784321465
    fixed: vendor fix RHSA-2026:47728
  • Red Hat OpenShift Container Platform 4.18 openshift4/ose-haproxy-router-rhel9 1783719377
    fixed: vendor fix RHSA-2026:40828
  • Red Hat OpenShift Container Platform 4.19 openshift4/ose-haproxy-router-rhel9 1783445642
    fixed: vendor fix RHSA-2026:37580
show 4 more
  • Red Hat OpenShift Container Platform 4.20 openshift4/ose-haproxy-router-rhel9 1781639027
    fixed: vendor fix RHSA-2026:27063
  • Red Hat OpenShift Container Platform 4.21 openshift4/ose-haproxy-router-rhel9 1781552170
    fixed: vendor fix RHSA-2026:27044
  • Red Hat OpenShift Container Platform 4.22 openshift4/ose-haproxy-router-rhel9 1781643967
    fixed: vendor fix RHSA-2026:27009
  • Red Hat OpenShift Container Platform 4.12 openshift4/ose-cli 1784322597, openshift4/ose-pod 1785268180, openshift4/ose-etcd 1784322408, openshift4/ose-tests 1784325700, openshift4/ose-console 1784324111, openshift4/ose-coredns 1784322578, +183 more Red Hat OpenShift Container Platform 4.13 openshift4/ose-cli 1784055846, openshift4/ose-pod 1784055815, openshift4/ose-tests 1784058416, openshift4/ose-console 1784055834, openshift4/ose-coredns 1784055661, openshift4/ose-deployer 1784057347, +184 more Red Hat OpenShift Container Platform 4.14 openshift4/ose-cli 1784581608, openshift4/ose-pod 1784584804, openshift4/ose-tests 1784635658, openshift4/ose-console 1784585123, openshift4/ose-coredns 1784582576, openshift4/ose-deployer 1784587531, +191 more Red Hat OpenShift Container Platform 4.15 openshift4/ose-cli 1784603774, openshift4/ose-tests 1784606212, openshift4/ose-console 1784579087, openshift4/ose-deployer 1784604914, openshift4/ose-installer 1784592112, openshift4/ose-pod-rhel9 1784580478, +186 more Red Hat OpenShift Container Platform 4.16 openshift4/ose-cli-rhel9 1784372018, openshift4/ose-pod-rhel9 1784372274, openshift4/ose-sdn-rhel9 1784371970, openshift4/ose-etcd-rhel9 1784371798, openshift4/ose-tests-rhel9 1783542114, openshift4/ose-tools-rhel9 1784317608, +184 more Red Hat OpenShift Container Platform 4.17 openshift4/frr-rhel9 1784323435, openshift4/ose-cli-rhel9 1784327350, openshift4/ose-pod-rhel9 1784317566, openshift4/ose-etcd-rhel9 1784313998, openshift4/ose-tests-rhel9 1784717215, openshift4/ose-tools-rhel9 1784715500, +182 more
    +5 more products
    Red Hat OpenShift Container Platform 4.18 openshift4/frr-rhel9 1783703071, openshift4/ose-cli-rhel9 1783707097, openshift4/ose-pod-rhel9 1783714165, openshift4/ose-etcd-rhel9 1783747104, openshift4/ose-tests-rhel9 1783694182, openshift4/ose-tools-rhel9 1783692649, +182 more Red Hat OpenShift Container Platform 4.19 openshift4/frr-rhel9 1783088445, openshift4/ose-cli-rhel9 1783089721, openshift4/ose-pod-rhel9 1783094561, openshift4/ose-etcd-rhel9 1783088169, openshift4/ose-tests-rhel9 1783526049, openshift4/ose-tools-rhel9 1783524559, +182 more Red Hat OpenShift Container Platform 4.20 openshift4/ose-tests-rhel9 1781197253, openshift4/ose-tools-rhel9 1781178474, openshift4/ose-ironic-rhel9 1781523440, openshift4/ose-console-rhel9 1781688743, openshift4/network-tools-rhel9 1781572534, openshift4/driver-toolkit-rhel9 1781291207, +19 more Red Hat OpenShift Container Platform 4.21 openshift4/ose-tests-rhel9 1781731819, openshift4/ose-tools-rhel9 1781730156, openshift4/ose-ironic-rhel9 1781294092, openshift4/ose-console-rhel9 1781732044, openshift4/network-tools-rhel9 1781731686, openshift4/ose-installer-rhel9 1781129187, +18 more Red Hat OpenShift Container Platform 4.22 openshift4/frr-rhel9 1781730190, openshift4/ose-cli-rhel9 1781641484, openshift4/ose-pod-rhel9 1781639781, openshift4/ose-etcd-rhel9 1781640140, openshift4/ose-tests-rhel9 1781645479, openshift4/ose-tools-rhel9 1781640380, +182 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADP 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • Red Hat Red Hat OpenShift Container Platform 4.12
  • Red Hat Red Hat OpenShift Container Platform 4.13
  • Red Hat Red Hat OpenShift Container Platform 4.14
  • Red Hat Red Hat OpenShift Container Platform 4.15
  • Red Hat Red Hat OpenShift Container Platform 4.16
  • Red Hat Red Hat OpenShift Container Platform 4.17
  • Red Hat Red Hat OpenShift Container Platform 4.18
  • Red Hat Red Hat OpenShift Container Platform 4.19
  • Red Hat Red Hat OpenShift Container Platform 4.20
  • Red Hat Red Hat OpenShift Container Platform 4.21
  • Red Hat Red Hat OpenShift Container Platform 4.22

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.