Authentication Bypass Affecting kcp-0.29 package, versions <0.29.3-r2


Severity

Recommended
0.0
critical
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

EPSS
0.44% (35th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-CHAINGUARDLATEST-KCP029-16061746
  • published15 Apr 2026
  • disclosed8 Apr 2026

Introduced: 8 Apr 2026

CVE-2026-39429  (opens in a new tab)
CWE-302  (opens in a new tab)
CWE-862  (opens in a new tab)

How to fix?

Upgrade Chainguard kcp-0.29 to version 0.29.3-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kcp-0.29 package and not the kcp-0.29 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior to 0.30.3 and 0.29.3, the cache server is directly exposed by the root shard and has no authentication or authorization in place. This allows anyone who can access the root shard to read and write to the cache server. This vulnerability is fixed in 0.30.3 and 0.29.3.

CVSS Base Scores

version 3.1