CVE-2026-65834

MEDIUM

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

Title source: cna

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.

References (2)

Core 2

Core References

X_Refsource_Confirm x_refsource_confirm

https://github.com/projectcapsule/capsule/security/advisories/GHSA-68cj-mvg9-rgm2

X_Refsource_Misc x_refsource_misc

https://github.com/projectcapsule/capsule/releases/tag/v0.13.8

Scores

CVSS v3 6.8

Attack Vector NETWORK

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

Details

CWE

CWE-20 CWE-248

Status published

Products (1)

projectcapsule/capsule < 0.13.8

Published Jul 30, 2026

Tracked Since Jul 31, 2026