What is CVE-2026-39429?

CVE-2026-39429 is a high-severity vulnerability in Kcp-dev Kcp, classified under Missing Authorization. CVSS score: 8.2/10. Published 2026-04-08.

How severe is CVE-2026-39429?

High severity. CVSS v3 base score is 8.2 out of 10.

Auth bypass in Kcp-dev Kcp

CVE-2026-39429

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…

Vulnerability class: Broken Access Control

EPSS: 0.001 (29.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

Affected products

Kcp-dev Kcp — versions >= 0.30.0, < 0.30.3, < 0.29.3

Weakness classification (CWE)

References

https://github.com/kcp-dev/kcp/security/advisories/GHSA-3j3q-wp9x-585p (x_refsource_CONFIRM)
https://github.com/kcp-dev/kcp/releases/tag/v0.29.3 (x_refsource_MISC)
https://github.com/kcp-dev/kcp/releases/tag/v0.30.3 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-39429?: CVE-2026-39429 is a high-severity vulnerability in Kcp-dev Kcp, classified under Missing Authorization. CVSS score: 8.2/10. Published 2026-04-08.
How severe is CVE-2026-39429?: High severity. CVSS v3 base score is 8.2 out of 10.