CVE-2026-65601 Details
Description
Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.
A namespace confusion vulnerability has been identified in Traefik versions 3.7.0 prior to 3.7.7, within the Kubernetes Gateway API provider. The issue arises when Traefik resolves the 'extensionRef' in backend references of HTTP routes, as it incorrectly uses the backend service namespace instead of the HTTP route namespace. This flaw allows a low-privileged route author with a 'ReferenceGrant' for a cross-namespace service to bind a Traefik middleware from the backend namespace, potentially injecting trusted reverse-proxy identity headers into downstream requests.
Users can upgrade to Traefik version 3.7.7 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 23, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| traefik traefik | >= 3.7.0, < 3.7.7 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 6, 2026 | Initial Analysis | [email protected] |
| Jul 23, 2026 | CVE Modified | CISA-ADP |
| Jul 22, 2026 | New CVE Received | [email protected] |