{"id":"CVE-2026-61795","summary":"Capsule: hostnameRegexHandler.OnUpdate validates stale (old) Tenant regex, allowing invalid AllowedHostnames regex to bypass webhook validation","details":"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.","aliases":["GHSA-f94q-w3w8-cj67"],"modified":"2026-09-19T03:47:21.776209661Z","published":"2026-09-18T16:31:42.182Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-697"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61795.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61795.json"},{"type":"FIX","url":"https://github.com/projectcapsule/capsule/commit/8d89d6865df6f41c7faa22fc9e807a57b01bfd0e"},{"type":"FIX","url":"https://github.com/projectcapsule/capsule/pull/1983"},{"type":"WEB","url":"https://github.com/projectcapsule/capsule/releases/tag/v0.13.7"},{"type":"ADVISORY","url":"https://github.com/projectcapsule/capsule/security/advisories/GHSA-f94q-w3w8-cj67"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61795"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/projectcapsule/capsule","events":[{"introduced":"c6e109ca46ed7de3a0f371df75e8abc993413a64"},{"fixed":"8d89d6865df6f41c7faa22fc9e807a57b01bfd0e"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0.13.0"},{"fixed":"0.13.7"}]}}],"versions":["v0.13.6","v0.13.5","v0.13.4","v0.13.3","v0.13.2","v0.13.1","v0.13.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61795.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H"}]}