{"cve":"CVE-2026-54765","nvd":{"published":"2026-07-06T21:16:57.067","modified":"2026-07-08T03:01:20.093","status":"Analyzed","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.","cvss_v4":{"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","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N","score":8.5},"cwes":["CWE-284","CWE-863"],"references":["https://github.com/traefik/traefik/commit/8aada7a7d52e4588a75386d8b86d270f6fe8d549","https://github.com/traefik/traefik/pull/13367","https://github.com/traefik/traefik/releases/tag/v3.7.6","https://github.com/traefik/traefik/security/advisories/GHSA-6p8f-p8j2-rqmv"],"products":["traefik:traefik"],"source":"nvd","synced_at":"2026-10-19T22:42:16.820116992+00:00"},"epss":{"cve":"CVE-2026-54765","score":0.00346,"percentile":0.28201,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6p8f-p8j2-rqmv","url":"https://osv.dev/vulnerability/GHSA-6p8f-p8j2-rqmv","summary":"Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port","modified":"2026-08-18T14:55:55.441127007Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":[">=3.7.0 <3.7.6"],"fixed":["3.7.6"]}]},{"id":"GO-2026-6205","url":"https://osv.dev/vulnerability/GO-2026-6205","summary":"Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port in github.com/traefik/traefik","modified":"2026-08-18T14:45:04.096233787Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":[">=3.7.0 <3.7.6"],"fixed":["3.7.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}