CVE-2026-61795

Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.7, hostnameRegexHandler.OnUpdate in internal/webhook/tenant/validation/hostname_regex.go reverses the new and old Tenant parameters and validates the previous AllowedHostnames.Regex instead of the submitted value. A cluster administrator can therefore store a malformed AllowedHostnames.Regex after the webhook accepts the update based on stale valid state. Subsequent Ingress creation or update reaches validate_hostnames.go, which evaluates the malformed pattern, ignores the regular-expression error, and treats every hostname as unmatched, blocking Ingress operations for the affected tenant until an administrator repairs the Tenant configuration. This issue is fixed in version 0.13.7.

• CWE-697

• https://github.com/projectcapsule/capsule/commit/8d89d6865df6f41c7faa22fc9e807a57b01bfd0e
• https://github.com/projectcapsule/capsule/pull/1983
• https://github.com/projectcapsule/capsule/releases/tag/v0.13.7
• https://github.com/projectcapsule/capsule/security/advisories/GHSA-f94q-w3w8-cj67

Published

Sep 18, 2026

Last Modified

Sep 18, 2026

Status

Received

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