projectcapsule Capsule up to 0.13.7 Configuration Admission Webhook forbidden_list.go regexp.MustCompile ForbiddenLabels.Regex/ForbiddenAnnotations.Regex input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.3$0-$5k1.67

Summaryinfo

A vulnerability categorized as problematic has been discovered in projectcapsule Capsule up to 0.13.7. Affected by this issue is the function regexp.MustCompile of the file pkg/api/forbidden_list.go of the component Configuration Admission Webhook. The manipulation of the argument ForbiddenLabels.Regex/ForbiddenAnnotations.Regex results in input validation. This vulnerability is cataloged as CVE-2026-65834. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in projectcapsule Capsule up to 0.13.7. Affected is the function regexp.MustCompile of the file pkg/api/forbidden_list.go of the component Configuration Admission Webhook. The manipulation of the argument ForbiddenLabels.Regex/ForbiddenAnnotations.Regex with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-65834 since 07/23/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are needed for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 0.13.8 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.5
VulDB Temp Score: 4.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Capsule 0.13.8

Timelineinfo

07/23/2026 CVE reserved
07/30/2026 +7 days Advisory disclosed
07/30/2026 +0 days VulDB entry created
07/30/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-65834 (🔒)
GCVE (CVE): GCVE-0-2026-65834
GCVE (VulDB): GCVE-100-384924

Entryinfo

Created: 07/30/2026 22:22
Changes: 07/30/2026 22:22 (59)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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