CVE-2026-65602
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.
- CVSS 4.0
- 5.3
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 3.1
- 8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 26% of CVEs (scores of 2026-10-25)
- CWE
- CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-42cj-m3vj-89wv | Go | github.com/traefik/traefik/v3 | >=3.6.0 <3.6.23 | 3.6.23 |
| GHSA-42cj-m3vj-89wv | Go | github.com/traefik/traefik/v3 | >=3.7.0 <3.7.7 | 3.7.7 |
| GO-2026-6192 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-6192 | Go | github.com/traefik/traefik/v2 | all versions | no fix published |
| GO-2026-6192 | Go | github.com/traefik/traefik/v3 | >=3.6.0 <3.6.23 >=3.7.0 <3.7.7 | 3.6.23, 3.7.7 |