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

Quick assessment

Affected
projectcapsule capsule
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Capsule 是一个面向 Kubernetes 的多租户及基于策略的管理框架。在版本 0.13.8 之前， 和 未通过配置准入 webhook 进行有效性验证。这导致集群管理员可以存储格式错误的正则表达式，这些表达式随后会在创建、更新或补丁节点请求时，经由 传递至 中的 函数，从而引发节点准入 webhook 崩溃。该问题已在 0.13.8 版本中得到修复。

CVSS 6.8 · Medium EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
projectcapsule capsule < 0.13.8 affected
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I. Basic Information for CVE-2026-65834

Vulnerability Information
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Vulnerability Title
Capsule: CapsuleConfiguration NodeMetadata regex fields lack webhook validation, allowing MustCompile panic on all Node admission requests
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
projectcapsule capsule < 0.13.8 -

II. Public POCs for CVE-2026-65834

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III. Intelligence Information for CVE-2026-65834

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Vendor Advisories for CVE-2026-65834 (1)

Vendor Pages for CVE-2026-65834 (1)

IV. Related Vulnerabilities

Same product: capsule
Same vendor: projectcapsule
Same weakness: CWE-20

V. Comments for CVE-2026-65834

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