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CVE-2026-61794— Capsule: Malformed ForbiddenAnnotations.Regex can bypass Tenant validation and trigger namespace admission panic

Quick assessment

Affected
projectcapsule capsule
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-61794

Vulnerability Information

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Vulnerability Title
Capsule: Malformed ForbiddenAnnotations.Regex can bypass Tenant validation and trigger namespace admission panic
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
projectcapsule capsule >= 0.13.0, < 0.13.7 -

II. Public POCs for CVE-2026-61794

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III. Intelligence Information for CVE-2026-61794

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Patches & Fixes for CVE-2026-61794 (2)

Other References for CVE-2026-61794 (2)

Same Patch Batch · projectcapsule · 2026-09-18 · 3 CVEs total

CVE-2026-61672 7.1 HIGH Capsule: Tenant owner bypasses Capsule's forbidden namespace/service/node label and annota
CVE-2026-61795 6.8 MEDIUM Capsule: hostnameRegexHandler.OnUpdate validates stale (old) Tenant regex, allowing invali

IV. Related Vulnerabilities

Same product: capsule
Same vendor: projectcapsule
Same weakness: CWE-20

V. Comments for CVE-2026-61794

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