CVE-2026-65602
Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jul 22, 2026
- Updated
- Oct 8, 2026
- Reserved
- Jul 22, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | VulnCheck |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
traefiktraefik |
|
traefiktraefik |
|
References
- GitHub Security Advisory (GHSA-42cj-m3vj-89wv)vendor-advisory
- Patch Commitpatch
- VulnCheck Advisory: Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypassthird-party-advisory
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