CVE-2026-54761

The record

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.21 and 3.7.5, there is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple (WRR) backendRefs, Traefik evaluates the allowlist against the target backendRef.namespace instead of the route's own namespace. As a result, an HTTPRoute created in a namespace that is not allow-listed can reference a cross-provider TraefikService such as api@internal, dashboard@internal or rest@internal by pointing backendRef.namespace at an allow-listed namespace covered by a Gateway API ReferenceGrant, exposing internal Traefik services on the data plane. Exploitation requires the ability to create an accepted HTTPRoute and a matching ReferenceGrant from an allow-listed namespace; it does not require any change to Traefik static configuration, RBAC, or the deployment itself. This vulnerability is fixed in 3.6.21 and 3.7.5.

Affected packages

Related vulnerabilities

• CVE-2026-114574 A security vulnerability has been detected in massCodeIO massCode 5.10. CWE-284
• CVE-2026-83395 Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise… CWE-284
• CVE-2026-112091 A flaw has been found in Dav-ee dairy-management-system… CWE-284
• CVE-2026-106580 ImageMagick is free and open-source software used for editing and manipulating digital… CWE-284
• CVE-2026-61700 MariaDB Connector/J is used to connect applications developed in Java to MariaDB and… CWE-284
• CVE-2026-86812 The WPCafe WordPress plugin before 3.0.18 does not correctly restrict access to a set of… CWE-284
• CVE-2026-85545 There is an Vulnerability in some HikCentral Access Control versions. CWE-284
• CVE-2026-78084 Joomla Extension - joomshaper.com - Missing Access Control in Gallery Image Management in… CWE-284