---
id: CVE-2026-61794
title: Capsule is a multi-tenancy and policy-based framework for Kubernetes
summary: >-
  Capsule is a multi-tenancy and policy-based framework for Kubernetes. From
  0.13.0 until 0.13.7, the Tenant update validation in
  internal/webhook/tenant/validation/forbidden_annotations_regex.go compiles
  ForbiddenLabels.Regex for both the…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-20
vendor: projectcapsule
product: capsule
affected:
  - 'capsule >= 0.13.0, < 0.13.7'
patched:
  - github.com/projectcapsule/capsule 0.13.7
published: '2026-09-18'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:25:27.050'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61794'
references:
  - url: >-
      https://github.com/projectcapsule/capsule/commit/8d89d6865df6f41c7faa22fc9e807a57b01bfd0e
    label: security-advisories@github.com
  - url: 'https://github.com/projectcapsule/capsule/pull/1983'
    label: security-advisories@github.com
  - url: 'https://github.com/projectcapsule/capsule/releases/tag/v0.13.7'
    label: security-advisories@github.com
  - url: >-
      https://github.com/projectcapsule/capsule/security/advisories/GHSA-gxjc-74v5-3vx3
    label: security-advisories@github.com
  - url: >-
      https://github.com/projectcapsule/capsule/security/advisories/GHSA-gxjc-74v5-3vx3
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-gxjc-74v5-3vx3'
  - url: 'https://github.com/projectcapsule/capsule'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - go
  - osv
epss: 0.00587
epssPercentile: 0.45722
aliases:
  - GHSA-gxjc-74v5-3vx3
ecosystem: go
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T14:54:51.882379Z'
scores:
  nvd: 6.8
  ghsa: 4.9
  cna: 6.8
  osv: 4.9
ingestedAt: '2026-09-18T16:45:41.407Z'
---

## Overview

Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.7, the Tenant update validation in internal/webhook/tenant/validation/forbidden_annotations_regex.go compiles ForbiddenLabels.Regex for both the labels and annotations checks instead of validating ForbiddenAnnotations.Regex. An administrator who can update a Tenant can therefore persist a malformed ForbiddenAnnotations.Regex while leaving the labels expression valid. Namespace creation or update later passes the stored expression through pkg/api/forbidden_list.go, where regexp.MustCompile can panic during forbidden metadata validation and deny namespace operations for the affected tenant. This issue is fixed in version 0.13.7.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-61794)

Affected packages:

- `github.com/projectcapsule/capsule >= 0.13.0, < 0.13.7`

Patched in:

- `github.com/projectcapsule/capsule 0.13.7`

Source: https://github.com/advisories/GHSA-gxjc-74v5-3vx3