What’s Vulnerable › Vulnerabilities

CVE-2026-65834: Capsule: CapsuleConfiguration NodeMetadata regex fields lack webhook validation, allowing MustCompile panic on all Node admission requests

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-10-23
• Weakness: CWE-20

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.

Affected products

• projectcapsule capsule: before 0.13.8

References

• https://github.com/projectcapsule/capsule/releases/tag/v0.13.8
• https://github.com/projectcapsule/capsule/security/advisories/GHSA-68cj-mvg9-rgm2
• https://github.com/projectcapsule/capsule/security/advisories/GHSA-68cj-mvg9-rgm2

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