Capsule: hostnameRegexHandler.OnUpdate validates stale (old) Tenant regex, allowing invalid AllowedHostnames regex to bypass webhook validation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61795
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 17:16:58 UTC
Updated2026-09-24 21:25:27 UTC
DescriptionCapsule 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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

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

EPSS: 0.005870000 probability, percentile 0.457940000 (date 2026-09-25)

Problem Types: CWE-697 | CWE-697 CWE-697: Incorrect Comparison

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Projectcapsule Capsule affected >= 0.13.0, < 0.13.7 Not specified

References

ReferenceSourceLinkTags
github.com/projectcapsule/capsule/pull/1983 [email protected] github.com
github.com/projectcapsule/capsule/releases/tag/v0.13.7 [email protected] github.com
github.com/projectcapsule/capsule/security/advisories/GHSA-f94q-w3w8-cj67 [email protected] github.com
github.com/projectcapsule/capsule/commit/8d89d6865df6f41c7faa22fc9e807a5... [email protected] github.com
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