CVE-2026-65834Public exploitNetwork attack vector

Node admission webhook crash via malformed regex

Published Jul 30, 2026 · Updated Jul 30, 2026

Improper input validation in Project Capsule's Capsule before 0.13.8 allows remote authenticated users to interrupt Node admission. The configuration admission webhook stores unvalidated NodeMetadata forbidden-label or forbidden-annotation regexes, and RegexMatch passes them to regexp.MustCompile. Cluster Administrator access is required; one malformed stored expression makes every Node create, update, or patch request panic the node webhook.

CVSS severity6.8
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Project Capsule's Capsule before 0.13.8 allows remote authenticated users to interrupt Node admission. The configuration admission webhook stores unvalidated NodeMetadata forbidden-label or forbidden-annotation regexes, and RegexMatch passes them to regexp.MustCompile. Cluster Administrator access is required; one malformed stored expression makes every Node create, update, or patch request panic the node webhook.

The record

CVE
CVE-2026-65834
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
Project Capsule
Product
Capsule
Classifications
CWE-248, CWE-20, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.13.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Project Capsule · Capsuleversion=< 0.13.8

Published CVSS scores

6.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-248Uncaught Exception
CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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