kcp's cache server is accessible without authentication or authorization checks

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Summary

CVECVE-2026-39429
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-08 21:16:59 UTC
Updated2026-04-08 21:26:13 UTC
Descriptionkcp 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

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

Problem Types: CWE-302 | CWE-862 | CWE-862 CWE-862: Missing Authorization | CWE-302 CWE-302: Authentication Bypass by Assumed-Immutable Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Kcp-dev Kcp affected >= 0.30.0, < 0.30.3 Not specified
CNA Kcp-dev Kcp affected < 0.29.3 Not specified

References

ReferenceSourceLinkTags
github.com/kcp-dev/kcp/security/advisories/GHSA-3j3q-wp9x-585p [email protected] github.com
github.com/kcp-dev/kcp/releases/tag/v0.29.3 [email protected] github.com
github.com/kcp-dev/kcp/releases/tag/v0.30.3 [email protected] github.com
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