Is CVE-2026-65834 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-65834 being exploited in the wild.

How severe is CVE-2026-65834?

Medium severity, with a CVSS score of 6.8, published 30 July 2026.

Which products and versions are affected?

github.com/projectcapsule/capsule (Go) <= 0.13.7, SEMVER:introduced=0,fixed=0.13.8; Project Capsule Capsule < 0.13.8, <= 0.13.7.

Is there a fix for CVE-2026-65834?

Yes. github.com/projectcapsule/capsule (Go): upgrade to 0.13.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-65834 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-65834?

Check whether you run github.com/projectcapsule/capsule (Go) or Project Capsule Capsule at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-65834: Project Capsule Denial of Service via malformed NodeMetadata regex

Q: Is there a fix for CVE-2026-65834?

Yes. github.com/projectcapsule/capsule (Go): upgrade to 0.13.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-65834 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-65834?

Check whether you run github.com/projectcapsule/capsule (Go) or Project Capsule Capsule at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-65834 · Severity: medium · CVSS 6.8 · Published 2026-07-30

Capsule is a tool used to manage multi-tenancy in Kubernetes clusters. A vulnerability exists where a cluster administrator can provide a malformed regular expression in the configuration settings, which causes the system to crash whenever any node in the cluster is updated or created. This results in a cluster-wide denial of service, preventing new nodes from joining, existing nodes from being maintained, or any metadata changes from being processed.

Technologies: github.com/projectcapsule/capsule (Go), Project Capsule Capsule. Vendors: Go, Project Capsule.

Quick answers

Is CVE-2026-65834 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-65834 being exploited in the wild.
How severe is CVE-2026-65834?: Medium severity, with a CVSS score of 6.8, published 30 July 2026.
Which products and versions are affected?: github.com/projectcapsule/capsule (Go) <= 0.13.7, SEMVER:introduced=0,fixed=0.13.8; Project Capsule Capsule < 0.13.8, <= 0.13.7.
Is there a fix for CVE-2026-65834?: Yes. github.com/projectcapsule/capsule (Go): upgrade to 0.13.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-65834 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-65834?: Check whether you run github.com/projectcapsule/capsule (Go) or Project Capsule Capsule at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

github.com/projectcapsule/capsule (Go): upgrade to 0.13.8 or later
```
go get github.com/projectcapsule/capsule@v0.13.8
```

Technical details

The vulnerability is a denial-of-service (DoS) caused by a lack of input validation in the Capsule admission webhook. Specifically, the `ForbiddenLabels.Regex` and `ForbiddenAnnotations.Regex` fields in `CapsuleConfiguration` are not validated before being persisted to etcd. When a Node `CREATE`, `UPDATE`, or `PATCH` request occurs, the downstream consumer calls `regexp.MustCompile()` on these stored strings. Because `MustCompile` panics on invalid regex patterns, a malformed entry crashes the webhook process. This blocks all node-related operations cluster-wide, including autoscaling and maintenance. The issue was addressed in version 0.13.8 by adding a dedicated regex validator to the configuration webhook.

Affected products

Project Capsule Capsule <= 0.13.7

Identifiers

CVE-2026-65834
GHSA-68cj-mvg9-rgm2
GO-2026-6155

Timeline

2026-07-08: disclosed
2026-07-31: advisory
2026-07-31: patched: Fixed in version 0.13.8

References

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