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Vulnerability Details :

CVE-2026-41174

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-30 Apr, 2026 | 20:20
Updated At-04 May, 2026 | 13:26
Rejected At-
Credits

Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:30 Apr, 2026 | 20:20
Updated At:04 May, 2026 | 13:26
Rejected At:
â–¼CVE Numbering Authority (CNA)
Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

Affected Products
Vendor
traefik
Product
traefik
Versions
Affected
  • < 2.11.43
  • >= 3.7.0-ea.1, < 3.7.0-rc.2
Problem Types
TypeCWE IDDescription
CWECWE-863CWE-863: Incorrect Authorization
CWECWE-653CWE-653: Improper Isolation or Compartmentalization
Type: CWE
CWE ID: CWE-863
Description: CWE-863: Incorrect Authorization
Type: CWE
CWE ID: CWE-653
Description: CWE-653: Improper Isolation or Compartmentalization
Metrics
VersionBase scoreBase severityVector
4.04.8MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Version: 4.0
Base score: 4.8
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq
x_refsource_CONFIRM
https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d
x_refsource_MISC
https://github.com/traefik/traefik/releases/tag/v2.11.43
x_refsource_MISC
https://github.com/traefik/traefik/releases/tag/v3.6.14
x_refsource_MISC
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
x_refsource_MISC
Hyperlink: https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d
Resource:
x_refsource_MISC
Hyperlink: https://github.com/traefik/traefik/releases/tag/v2.11.43
Resource:
x_refsource_MISC
Hyperlink: https://github.com/traefik/traefik/releases/tag/v3.6.14
Resource:
x_refsource_MISC
Hyperlink: https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
Resource:
x_refsource_MISC
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:30 Apr, 2026 | 21:16
Updated At:01 May, 2026 | 17:39

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.04.8MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.16.4MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Type: Secondary
Version: 4.0
Base score: 4.8
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 6.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CPE Matches

traefik
traefik
>>traefik>>Versions before 2.11.43(exclusive)
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
traefik
traefik
>>traefik>>Versions from 3.0.0(inclusive) to 3.6.14(exclusive)
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
traefik
traefik
>>traefik>>3.7.0
cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:*
traefik
traefik
>>traefik>>3.7.0
cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:*
traefik
traefik
>>traefik>>3.7.0
cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:*
traefik
traefik
>>traefik>>3.7.0
cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-653Primarysecurity-advisories@github.com
CWE-863Primarysecurity-advisories@github.com
CWE ID: CWE-653
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-863
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414dsecurity-advisories@github.com
Patch
https://github.com/traefik/traefik/releases/tag/v2.11.43security-advisories@github.com
Product
Release Notes
https://github.com/traefik/traefik/releases/tag/v3.6.14security-advisories@github.com
Product
Release Notes
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2security-advisories@github.com
Product
Release Notes
https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgqsecurity-advisories@github.com
Exploit
Patch
Vendor Advisory
Hyperlink: https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/traefik/traefik/releases/tag/v2.11.43
Source: security-advisories@github.com
Resource:
Product
Release Notes
Hyperlink: https://github.com/traefik/traefik/releases/tag/v3.6.14
Source: security-advisories@github.com
Resource:
Product
Release Notes
Hyperlink: https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
Source: security-advisories@github.com
Resource:
Product
Release Notes
Hyperlink: https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq
Source: security-advisories@github.com
Resource:
Exploit
Patch
Vendor Advisory

Change History

0
Information is not available yet

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Details not found