CVE-2026-65834: Capsule is a multi-tenancy and policy-based framework for Kubernetes. Prior to 0.13.8, CapsuleConfiguration.Spec.NodeMetadata.ForbiddenLabels.Regex and CapsuleConfiguration.Spec.No

mediumCVSS 6.8CVE-2026-65834

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 6.8
Published: 2026-07-30
Last updated: 2026-07-31
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-65834

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-658340.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-65834	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumGHSA-68cj-mvg9-rgm2: Capsule: CapsuleConfiguration NodeMetadata regex fields lack webhook validation, allowing…ghsa

Recent advisories for Capsule is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumGHSA-jr6p-8pjj-mfx6: Capsule has an incomplete fix of CVE-2026-22872: TenantResource RawItems and Generators s…ghsa · 2026-07-31
mediumGHSA-68cj-mvg9-rgm2: Capsule: CapsuleConfiguration NodeMetadata regex fields lack webhook validation, allowing…ghsa · 2026-07-31
mediumCVE-2026-65835: Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.8…nvd · 2026-07-30
mediumGHSA-g35j-m5xg-vh3q: webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsulesghsa · 2026-07-24
mediumCVE-2026-8996: The Backup and Staging by WP Time Capsule plugin for WordPress is vulnerable to Sensitive Infor…nvd · 2026-07-09