CVE-2026-65602 PUBLISHED

Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass

Assigner: VulnCheck
Reserved: 22.07.2026 Published: 22.07.2026 Updated: 22.07.2026

Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references (the allowlist was only enforced for HTTP serversTransport references). A low-privileged Kubernetes user in a namespace not listed in crossProviderNamespaces can set serversTransport: foo@file on an IngressRouteTCP service, causing Traefik to accept the forbidden cross-provider reference and use a file-provider TCPServersTransport — including privileged backend mTLS client certificates, SPIFFE identity, or PROXY-protocol settings. This is fixed in 3.6.23 and 3.7.7.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
CVSS Score: 5.3

Product Status

Vendor traefik
Product traefik
Versions Default: unaffected
  • affected from 3.6.0 to 3.6.23 (excl.)
  • Version 3.6.23 is unaffected
Vendor traefik
Product traefik
Versions Default: unaffected
  • affected from 3.7.0 to 3.7.7 (excl.)
  • Version 3.7.7 is unaffected

Credits

  • CuB3y0nd reporter
  • james-yusuke reporter

References

Problem Types

  • Incorrect Authorization CWE