openshift/router: openshift/router: mTLS client certificate spoofing via unstripped X-SSL-Client headers on HTTP frontend
cve CVE-2026-46579 2 sources, 2 claims · Watch
Red Hat writes:
openshift/router: openshift/router: mTLS client certificate spoofing via unstripped X-SSL-Client headers on HTTP frontend the claim
openshift/router: openshift/router: mTLS client certificate spoofing via unstripped X-SSL-Client headers on HTTP frontend the claim
- Severity
- HIGH NVDimportant Red Hat
- CVSS they disagree
- 7.5 NVD7.4 Red Hat
- Vendor
- Red Hat NVD
- Product
- Red Hat OpenShift Container Platform 4.12 NVD
- CWE
- CWE-287 NVDCWE-287 Red Hat
How far exploitation has got
- No public code known
- Proof of concept
- Proof of concept, verified
- A Metasploit module
- Exploited in the wild
- Used in ransomware campaigns
Why the CVSS differs
| Metric | NVD | Red Hat |
|---|---|---|
| Attack vector AV | network N | network N |
| Attack complexity AC | low L | high H |
| Privileges required PR | none N | none N |
| User interaction UI | none N | none N |
| Scope S | unchanged U | unchanged U |
| Confidentiality C | none N | high H |
| Integrity I | high H | high H |
| Availability A | none N | none N |
Each source scores the same vulnerability from what it judges the attack to need. The rows marked are where they judge it differently.
Timeline
| 2026-04-17 | first spoke of it: openshift/router: openshift/router: mTLS client certificate spoofing via unstripped X-SSL-Client headers on HTTP frontend | Red Hat |
| 2026-05-29 | first spoke of it: 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. | NVD |
What it is to other things
| affects | redhat/openshift_container_platform NVD |
| affects | redhat/openshift_router NVD |
| made_by | redhat NVD |
In words only, so not counted until a person confirms one:
| made_by | red_hatNVD says “Red Hat” |
| affects | red_hat/red_hat_openshift_container_platform_4_12NVD says “Red Hat · Red Hat OpenShift Container Platform 4.12” |
Every value, with what each source said and its receipt
| Property | Source | Said | Means here | ||||
|---|---|---|---|---|---|---|---|
| Automatable automatable | NVD | no At least one of those steps needs a person. receipt
What the source handed over{
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} | — | ||||
| CVSS cvss conflict | NVD | 7.5receipt
What the source handed over{
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} | — | ||||
| CVSS cvss conflict | Red Hat | 7.4receipt
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"severity": "important"
} | — | ||||
| CVSS vector cvss_vector not compared | NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nreceipt
What the source handed over{
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} | — | ||||
| CVSS vector cvss_vector not compared | Red Hat | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nreceipt
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} | — | ||||
| CWE cwe | NVD | CWE-287receipt
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} | — | ||||
| CWE cwe | Red Hat | CWE-287receipt
What the source handed over{
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"CWE": "CWE-287",
"advisories": [
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"RHSA-2026:47728",
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"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-46579.json",
"severity": "important"
} | — | ||||
| Exploitation exploitation | NVD | none No evidence of exploitation, and no public proof of concept. receipt
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} | — | ||||
| Packages packages | Red Hat | openshift4/ose-haproxy-router:1784587649, openshift4/ose-haproxy-router-rhel9:1781552170, openshift4/ose-haproxy-router-rhel9:1783445642, openshift4/ose-haproxy-router:1784323891, openshift4/ose-haproxy-router-rhel9:1781643967, openshift4/ose-haproxy-router-rhel9:1784331638, openshift4/ose-haproxy-router:1784580646, openshift4/ose-haproxy-router-rhel9:1783719377, openshift4/ose-haproxy-router:1784056734, openshift4/ose-haproxy-router-rhel9:1781639027, openshift4/ose-haproxy-router-rhel9:1784321465receipt
What the source handed over{
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"CWE": "CWE-287",
"advisories": [
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"RHSA-2026:47728",
"RHSA-2026:40022",
"RHSA-2026:37580",
"RHSA-2026:40828",
"RHSA-2026:27063",
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],
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"package_state": null,
"public_date": "2026-04-17T20:10:23Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-46579.json",
"severity": "important"
} | — | ||||
| Product product | NVD | Red Hat OpenShift Container Platform 4.12receipt
What the source handed over{
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} | — | ||||
| Severity severity | NVD | HIGH From 7.0 to 8.9. receipt
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| Severity severity | Red Hat | important A flaw that can easily compromise confidentiality, integrity or availability. receipt
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| Status status | NVD | Modifiedreceipt
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} | — | ||||
| Technical impact technical_impact | NVD | total The attacker gains full control of the component, or all of its information. receipt
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} | — | ||||
| Vendor vendor | NVD | Red Hatreceipt
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} | — |
Every claim, by kind
vulnerability
| openshift/router: openshift/router: mTLS client certificate spoofing via unstripped X-SSL-Client headers on HTTP frontend zetlyn/cve-redhat · 2026-04-17 | cvss 7.4 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N cwe CWE-287 packages openshift4/ose-haproxy-router:1784587649, openshift4/ose-haproxy-router-rhel9:1781552170, openshift4/ose-haproxy-router-rhel9:1783445642, openshift4/ose-haproxy-router:1784323891, openshift4/ose-haproxy-router-rhel9:1781643967, openshift4/ose-haproxy-router-rhel9:1784331638, openshift4/ose-haproxy-router:1784580646, openshift4/ose-haproxy-router-rhel9:1783719377, openshift4/ose-haproxy-router:1784056734, openshift4/ose-haproxy-router-rhel9:1781639027, openshift4/ose-haproxy-router-rhel9:1784321465 severity important | source |
| 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. zetlyn/cve-nvd · 2026-05-29 | automatable no cvss 7.5 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N cwe CWE-287 exploitation none product Red Hat OpenShift Container Platform 4.12 severity HIGH status Modified technical_impact total vendor Red Hat | source |