PT-2026-63359 · Traefik · Traefik

Cub3Y0Nd · CVE-2026-65601 · Published 2026-07-22 · Updated 2026-07-22

Positive Technologies (AI Summary)

CVSS v4.0

5.3

Medium

Base vector

AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Name of the Vulnerable Software and Affected Versions Traefik versions 3.7.0 through 3.7.6

Description A namespace confusion issue exists in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, the system incorrectly uses the backend Service namespace instead of the HTTPRoute namespace. This allows a low-privileged route author with a ReferenceGrant for a cross-namespace Service to bind a Traefik Middleware from the backend namespace without the required separate grant, which could lead to the injection of trusted reverse-proxy identity headers into downstream requests.

Recommendations Update Traefik to version 3.7.7.

Exploit

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-65601

GHSA-QQ9Q-X9W4-CHHJ

Affected Products

Traefik

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65601.json · Exploit
• https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj · Vendor Advisory
• https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-65601 · Security Note
• https://osv.dev/vulnerability/CVE-2026-65601 · Vendor Advisory
• https://vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref · Note