CVE-2026-65834: medium-severity vulnerability in projectcapsule capsule
Capsule: CapsuleConfiguration NodeMetadata regex fields lack webhook validation, allowing MustCompile panic on all Node admission requests
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.8epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Affected products
projectcapsule · capsuleRelated CVEs — projectcapsule capsule
In the same product, most dangerous first.
CVE-2026-22872MEDIUMCapsule TenantResource RawItems Cluster-Scoped Resource Creation VulnerabilityEPSS 0.7%CVE-2026-61795MEDIUMCapsule: hostnameRegexHandler.OnUpdate validates stale (old) Tenant regex, allowing invalid AllowedHostnames regex to bypass webhook validationEPSS 0.6%CVE-2026-61794MEDIUMCapsule: Malformed ForbiddenAnnotations.Regex can bypass Tenant validation and trigger namespace admission panicEPSS 0.6%CVE-2024-39690HIGHCapsule tenant owner with "patch namespace" permission can hijack system namespacesEPSS 0.5%CVE-2025-55205CRITICALCapsule tenant owners with "patch namespace" permission can hijack system namespaces labelEPSS 0.5%CVE-2026-55636MEDIUMCapsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotectedEPSS 0.4%