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VulnerabilityPublished

CVE-2026-65834: projectcapsule capsule · Improper Input Validation

Affects projectcapsule capsuleSource CVE Database V5

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Not known to be exploited · CVSS 6.8 Medium : upgrade to 0.13.8 when convenient.

Data as of 29 Oct 2026, 07:15 UTC

CVSS 3.1 base score
6.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 25% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.13.8
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade capsule and projectcapsule/capsule to 0.13.8.

Affected software

ProductAffectedFixed in
projectcapsulecapsuleAffected
  • <0.13.8
Fixed in
  • 0.13.8
GitHubprojectcapsule/capsulepkg:github/projectcapsule/capsuleOther threatsAffected
  • <0.13.8
Fixed in
  • 0.13.8

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to projectcapsule Capsule version 0.13.8 or later, where the configuration admission webhook properly validates regex inputs to prevent malformed patterns. Patch status is confirmed fixed in 0.13.8. No other mitigation is indicated.

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.

References

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