CVE-2026-112778GHSA-rh7m-2m44-x32f
Traefik before 2.11.46, 3.6.17, and 3.7.1 Cross-Namespace Resource Reference via Kubernetes Annotations
traefik traefik
CVSS
6.4MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.19%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces. Attackers able to create or update Ingress or Service resources in one namespace can set router.middlewares or service.serverstransport annotations to obtain another tenant's injected credentials or reuse its client certificates, bypassing namespace-based tenant isolation.
Text from CVE List
Affected versions 6
- traefikaffected: all versions before 2.11.46CVE List
- traefikunaffected: 2.11.46CVE List
- traefikaffected: 3.0.0 before 3.6.17CVE List
- traefikunaffected: 3.6.17CVE List
- traefikaffected: 3.7.0 before 3.7.1CVE List
- traefikunaffected: 3.7.1CVE List