Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-54761— Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the allowlist to expose internal Traefik services

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 Traefik 3.6.21之前版本和3.7.0版本至3.7.5之前版本存在安全漏洞，该漏洞源于Kubernetes Gateway提供者中授权访问控制问题，可能导致在命名空间未允许列表中的HTTPRoute通过引用网关API ReferenceGrant覆盖的允许列表命名空间，暴露内部Traefik服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
traefik traefik < 3.6.21 affected
>= 3.7.0-ea.1, < 3.7.5 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-54761

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the allowlist to expose internal Traefik services
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 Traefik 3.6.21之前版本和3.7.0版本至3.7.5之前版本存在安全漏洞，该漏洞源于Kubernetes Gateway提供者中授权访问控制问题，可能导致在命名空间未允许列表中的HTTPRoute通过引用网关API ReferenceGrant覆盖的允许列表命名空间，暴露内部Traefik服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik < 3.6.21 -

II. Public POCs for CVE-2026-54761

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-54761

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-54761 (1)

Vendor Pages for CVE-2026-54761 (2)

Same Patch Batch · traefik · 2026-06-23 · 6 CVEs total

CVE-2026-53622 7.8 HIGH Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case ho
CVE-2026-48491 7.8 HIGH Traefik: SNICheck ignores wildcard TLSOptions mappings, allowing domain-fronted mTLS bypas
CVE-2026-48020 7.8 HIGH Traefik StripPrefix Route-Level Auth Bypass via Path Normalization
CVE-2023-54365 7.5 HIGH Traefik - Denial of Service via HTTP/2 Request Handling
CVE-2026-54762 Traefik Kubernetes Ingress NGINX provider fails open when auth-secret resolution fails

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-284

V. Comments for CVE-2026-54761

No comments yet

Leave a comment