GHSA-x45c-cvp8-q4fm
HIGHGHSA-x45c-cvp8-q4fm is a high-severity (CVSS 8.8) CWE-863 vulnerability in github.com/clastix/capsule. O3 Security confirms whether GHSA-x45c-cvp8-q4fm is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Capsule vulnerable to privilege escalation by ServiceAccount deployed in a Tenant Namespace
Blast Radius
github.com/clastix/capsuleReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Capsule implements a multi-tenant and policy-based environment in a Kubernetes cluster. A ServiceAccount deployed in a Tenant Namespace, when granted with PATCH capabilities on its own Namespace, is able to edit it and remove the Owner Reference, breaking the reconciliation of the Capsule Operator and removing all the enforcement like Pod Security annotations, Network Policies, Limit Range and Resource Quota items.
With that said, an attacker could detach the Namespace from a Tenant that is forbidding starting privileged Pods using the Pod Security labels by removing the OwnerReference, removing the enforcement labels, and being able to start privileged containers that would be able to start a generic Kubernetes privilege escalation.
Patches
Patches have been released for version 0.1.3 and all users must upgrade to this release.
Workarounds
N.A.
References
N.A.
For more information
If you have any questions or comments about this advisory:
- Open an issue in github.com/clastix/capsule
- Reach out on #capsule channel available on Kubernetes Slack workspace
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/clastix/capsule | all versions | 0.1.3 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/clastix/capsule. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/clastix/capsule to 0.1.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-x45c-cvp8-q4fm is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-x45c-cvp8-q4fm is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-x45c-cvp8-q4fm. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-x45c-cvp8-q4fm in your dependencies?
O3 detects GHSA-x45c-cvp8-q4fm across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.