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CVE

CVE-2026-39429

kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior t

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.

HIGH · CVSS 8.2 EPSS 0.00114
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-302Authentication Bypass by Assumed-Immutable Data
CWE-862Missing Authorization
▤

Affected Products & Versions

2
kcp< 0.29.3
kcp>= 0.30.0 and < 0.30.3
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go github.com/kcp-dev/kcp HIGH fixed in 0.30.3
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-3j3q-wp9x-585pgithub.com
▣

Scoring & Timeline

8.2
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Apr 2026 · 09:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/kcp-dev/kcp/releases/tag/v0.29.3Release Notes
https://github.com/kcp-dev/kcp/releases/tag/v0.30.3Release Notes
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