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Vulnerability · Published Jul 6, 2026 · Assigned by GitHub_M

CVE-2026-54765Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port

Medium 6.3

In plain English

A medium-severity improper access control in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium
Exploit odds (30 days)0.3%top 71.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Traefik is an open source HTTP reverse proxy and load balancer. From v3.7.0 prior to v3.7.6, Traefik's Kubernetes Gateway API provider may resolve two accepted HTTPRoutes that target the same backend Service:port but configure different backendRef filters to the same child service and apply only one route's filter set to all requests reaching that backend. In Gateway deployments where backendRef filters set security-sensitive headers, such as tenant identity, authorization context, or values the backend trusts, an attacker who can create an accepted HTTPRoute sharing the same backend Service:port may cause their route's filter context to be applied to another route's requests, potentially crossing namespace boundaries when a ReferenceGrant permits cross-namespace targeting. This issue is fixed in version v3.7.6.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/traefik/traefikno fix listedGO-2026-6205
Gogithub.com/traefik/traefik/v2no fix listedGO-2026-6205
Gogithub.com/traefik/traefik/v33.7.6GHSA-6p8f-p8j2-rqmv
Gogithub.com/traefik/traefik/v33.7.6GO-2026-6205

Affected products (as reported)

VendorProductVersions
traefik traefik >= 3.7.0, < 3.7.6

Weakness: CWE-284, CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N

References