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.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-65602 Source published Jul 22, 2026Source updated Jul 22, 2026

VulniPulse record published Jul 30, 2026Record updated Aug 11, 2026

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 11 days ago·verify at source

Fixed versions

3.6.23
3.7.7

Official advisory · high-confidence parse· fetched 11 days 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 11 days ago·verify at source

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