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GO-2026-6192 CVE-2026-65602 GHSA-42cj-m3vj-89wv

Traefik CRD IngressRouteTCP ServersTransport Cross-Provider Namespace Bypass in github.com/traefik/traefik

High Go
Severity
0.0 / 10
High · CVSS 4.0
Exploit chance (EPSS)
0.33%
Chance of exploitation in the next 30 days. Higher than 26.53% of scored vulnerabilities.
Known exploited
No
Not in CISA's catalog
Weakness
CWE-863 Incorrect Authorization
Fix
3.6.23
Upgrade github.com/traefik/traefik/v3 to this version or later

Description

Traefik CRD IngressRouteTCP ServersTransport Cross-Provider Namespace Bypass in github.com/traefik/traefik

Affected versions

Go

PackageVulnerableFixed in
github.com/traefik/traefik
all versions
 No fix yet
github.com/traefik/traefik/v2
all versions
 No fix yet
github.com/traefik/traefik/v3
>= 3.6.0, < 3.6.23
3.6.23
github.com/traefik/traefik/v3
>= 3.7.0, < 3.7.7
3.7.7
github.com/traefik/traefik/v3
>= 3.6.0, < 3.6.23
>= 3.7.0, < 3.7.7
3.6.23
3.7.7

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

github.com/traefik/traefik/v3 Go → 3.6.23

go
go get github.com/traefik/traefik/v3@v3.6.23 && go mod tidy

Severity breakdown

CVSS 4.0 0.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Attack vector
Network
Attack complexity
Low
Attack requirements
Present
Privileges required
Low
User interaction
None
Confidentiality (vulnerable system)
None
Integrity (vulnerable system)
None
Availability (vulnerable system)
None
Confidentiality (subsequent systems)
High
Integrity (subsequent systems)
High
Availability (subsequent systems)
None

CVSS 3.1 8.8

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Weakness

CWE-863: Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

How to prevent it
  • Architecture and Design: Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
  • Architecture and Design: Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor [REF-7].
  • Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
  • Architecture and Design: For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page. One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.
  • System Configuration, Installation: Use the access control capabilities of your operating system and server environment and define your access control lists accordingly. Use a "default deny" policy when defining these ACLs.

References

Advisories

Fixes and patches

Packages

Other links

Timeline

  1. Published
  2. Last updated by the source
  3. Latest EPSS score
AdvisorySeverityWhy it's related
GO-2026-6558
Traefik: BasicAuth singleflight coalescing reintroduces an unauthenticated username-enumeration timing oracle
Medium Also affects github.com/traefik/traefik
GHSA-f52w-8j3h-j724
Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
High Also affects github.com/traefik/traefik
GHSA-w4v4-9rw7-5326
Traefik: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') and Incorrect Authorization
Critical Also affects github.com/traefik/traefik
GHSA-qqjf-53cj-pwvv
Traefik HTTP/3 Backend NTLM Connection Reuse
Critical Also affects github.com/traefik/traefik
GO-2026-6467
Traefik entrypoint header-name sanitization bypassed via request trailers
High Also affects github.com/traefik/traefik
GHSA-rf44-j88r-hh8c
Traefik: ForwardAuth identity spoofing via dot-form header alias
High Also affects github.com/traefik/traefik
GHSA-7ghq-v6jf-g56c
Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded
Medium Also affects github.com/traefik/traefik
GHSA-62fc-8686-hfmq
Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
Medium Also affects github.com/traefik/traefik
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