CVE-2026-71327

HIGH

Traefik: Gateway API route identity collision allows cross-namespace backend hijacking

Title source: cna
STIX 2.1

Description

Traefik is an open source HTTP reverse proxy and load balancer. From 3.0.0 until 3.6.25 and 3.7.10, Traefik's Kubernetes Gateway API provider in pkg/provider/kubernetes/gateway/httproute.go, grpcroute.go, tcproute.go, and tlsroute.go builds HTTPRoute, GRPCRoute, TCPRoute, and TLSRoute router and service identities by hyphen-concatenating namespace, route name, Gateway identity, entry point, and rule index, allowing colliding Routes to overwrite another namespace's backend. This issue is fixed in 3.6.25 and 3.7.10.

References (5)

Core 5

Scores

CVSS v4 7.6
EPSS 0.0036
EPSS Percentile 29.1%
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-694
Status published
Products (2)
traefik/traefik >= 3.0.0, < 3.6.25
traefik/traefik >= 3.7.0, < 3.7.10
Published Aug 06, 2026
Tracked Since Aug 07, 2026