CVE-2026-65834

Capsule: CapsuleConfiguration NodeMetadata regex fields lack webhook validation, allowing MustCompile panic on all Node admission requests

State: Published
Severity: 6.8 Medium
Published: Jul 30, 2026
Updated: Jul 31, 2026
Reserved: Jul 22, 2026

Read the record on cve.org

Description

Capsule is a multi-tenancy and policy-based framework for Kubernetes. Prior to 0.13.8, CapsuleConfiguration.Spec.NodeMetadata.ForbiddenLabels.Regex and CapsuleConfiguration.Spec.NodeMetadata.ForbiddenAnnotations.Regex were not validated by the configuration admission webhook, allowing a Cluster Admin to store a malformed regex that later reached regexp.MustCompile in pkg/api/forbidden_list.go through internal/webhook/node/user_metadata.go and crashed the node admission webhook on Node create, update, or patch requests. This issue is fixed in version 0.13.8.

Scores

CVSS	Score	Vector	Source
3.1	6.8 Medium	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-20 Improper Input Validation
CWE-248 Uncaught Exception

Affected Products

Product	Versions
capsuleprojectcapsule	< 0.13.8Affected

References

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