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Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the allowlist to expose internal Traefik services

🗓️ 17 Jun 2026 14:01:48Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 12 Views

High severity: crossProviderNamespaces uses backendRef.namespace, enabling non-listed HTTPRoutes to expose internal Traefik services.

Related
Detection
Refs
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ATTACKERKB
CVE-2026-54761
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CVE
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23 Jun 202619:15
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Cvelist
CVE-2026-54761 Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the allowlist to expose internal Traefik services
23 Jun 202619:15
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Exploit for CVE-2026-54761
19 Jun 202613:29
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23 Jun 202619:15
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OSV
CGA-HV92-FC8X-GP7X
2 Jul 202612:36
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Vulners
Node
traefiktraefikRange3.7.0-ea.13.7.4go
OR
traefiktraefikRange1.7.34go
OR
traefiktraefikRange2.11.50go
OR
traefiktraefikRange3.6.20go

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17 Jun 2026 14:01Current
5.2Medium risk
Vulners AI Score5.2
CVSS 3.17.1
CVSS 46
EPSS0.00318
SSVC
12