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Vulnerability record · CVE-2026-39429 · published 8 April 2026

CVE-2026-39429: Kcp missing authorization vulnerability

Kcp · Kcp

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.

9.1 CVSS 3.1 Critical EPSS 0.54% · top 56.8% CWE-302 · CWE-302CWE-862 · Missing authorization
9.1CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
24 Jul 2026Last modified by NVD

Description

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/kcp-dev/kcp/releases/tag/v0.29.3 Release Notes
https://github.com/kcp-dev/kcp/releases/tag/v0.30.3 Release Notes
https://github.com/kcp-dev/kcp/security/advisories/GHSA-3j3q-wp9x-585p ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-39429), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.