Disclosure summary
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.
Source-reported weakness categories
CWE-863
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-65601
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| traefik | traefik | * {"versionStartIncluding":"3.7.0","versionEndExcluding":"3.7.7"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Patch
- github.com — Vendor Advisory
- www.vulncheck.com — Third Party Advisory
PUBLISHED 2026-07-22T08:18:20-04:00
MODIFIED 2026-10-08T12:17:29-04:00
INGESTED 2026-10-10T20:50:36-04:00