CVE-2026-39429
kcp's cache server is accessible without authentication or authorization checks
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.
INFO
Published Date :
April 8, 2026, 9:16 p.m.
Last Modified :
April 15, 2026, 7:15 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update kcp to version 0.30.3 or 0.29.3.
- Configure authentication and authorization for the cache server.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-39429.
| URL | Resource |
|---|---|
| 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 | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-39429 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-39429
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-39429 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-39429 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 15, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:kcp:kcp:*:*:*:*:*:*:*:* versions up to (excluding) 0.29.3 *cpe:2.3:a:kcp:kcp:*:*:*:*:*:*:*:* versions from (including) 0.30.0 up to (excluding) 0.30.3 Added Reference Type GitHub, Inc.: https://github.com/kcp-dev/kcp/releases/tag/v0.29.3 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/kcp-dev/kcp/releases/tag/v0.30.3 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/kcp-dev/kcp/security/advisories/GHSA-3j3q-wp9x-585p Types: Exploit, Mitigation, Vendor Advisory -
New CVE Received by [email protected]
Apr. 08, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N Added CWE CWE-302 Added CWE CWE-862 Added Reference https://github.com/kcp-dev/kcp/releases/tag/v0.29.3 Added Reference https://github.com/kcp-dev/kcp/releases/tag/v0.30.3 Added Reference https://github.com/kcp-dev/kcp/security/advisories/GHSA-3j3q-wp9x-585p