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Advisory severityMedium6.4Red Hat Linux

Medium [CVE-2026-65602] Information disclosure and integrity bypass via IngressRouteTCP cross-provider reference

This medium-severity Red Hat Linux advisory covers CVE-2026-65602 affecting Red Hat OpenShift Dev Spaces.

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CVE-2026-65602 Source published Source updated

VulniPulse record published Record updated

CVE-2026-65602
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references (the allowlist was only enforced for HTTP serversTransport references).

A low-privileged Kubernetes user in a namespace not listed in crossProviderNamespaces can set serversTransport: foo@file on an IngressRouteTCP service, causing Traefik to accept the forbidden cross-provider reference and use a file-provider TCPServersTransport — including privileged backend mTLS client certificates, SPIFFE identity, or PROXY-protocol settings.

This is fixed in 3.6.23 and 3.7.7. Red Hat OpenShift Dev Spaces ships a version of traefik affected by this vulnerability.

Exploitation requires specific Kubernetes RBAC permissions and a crossProviderNamespaces configuration with cross-provider TCPServersTransport resources. Red Hat severity: Moderate — CVSS 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N).

Weakness: CWE-863. Red Hat does not currently list a fixing RHSA for this CVE.

Affected versions
  • 3.6.0
  • 3.6.22
  • 3.7.0
  • 3.7.6

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions
  • 3.6.23
  • 3.7.7

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

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