CVE-2026-30963: Capsule is a multi-tenancy and policy-based framework for Kubernetes

Q: How do I fix CVE-2026-30963?

capsule: upgrade to 0.13.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-30963 being exploited?

CVE-2026-30963 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-30963 affect?

CVE-2026-30963 affects capsule. Severity is low (CVSS 3.9). Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. How

Q: How urgent is CVE-2026-30963?

Priority 27/100. Public exploit reference; On your watchlist

Routine

LOW 3.9WATCHLISTUPGRADE

CVE-2026-30963 is a low-severity flaw (CVSS 3.9) affecting capsule. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and namespace/status subresource APIs can also modify various fields of a namespace, including the metadata field. Prior to version 0.13.0, the webhook does not defin

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	3.9 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-06-01
Last modified	2026-07-22

Publisher (CNA): GitHub, Inc. · Vendor: projectcapsule

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-01 19:16 UTCPublished CVE record published
2026-07-22 07:10 UTCUpdated Record last modified

projectcapsule capsule UPGRADE

Affected: < 0.13.0

Fixed in: 0.13.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy capsule || rpm -q capsule || capsule --version

2. UPGRADE to 0.13.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade capsule

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade capsule

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-30963?

capsule: upgrade to 0.13.0. Exact commands for each OS are on this page.

Is CVE-2026-30963 being exploited?

CVE-2026-30963 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-30963 affect?

CVE-2026-30963 affects capsule. Severity is low (CVSS 3.9). Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. How

How urgent is CVE-2026-30963?

Priority 27/100. Public exploit reference; On your watchlist

Software pages

Kubernetes vulnerabilities

Related CVEs

CVE-2026-22872 CRITICAL 9.1 UPGRADE Capsule is a multi-tenancy and policy-based framework for Kubernetes

References

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