by Kastro
Paper/Archive/CVE-2026-39429

CVE-2026-39429

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

EPSS 0.4%CVSS 9.1
critical.is priorityof 100
35
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 37.9.379 × 207.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
kcp>= 0.30.0, < 0.30.3–CNA
kcp< 0.29.3–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub_M (CNA)8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/kcp-dev/kcp/security/advisories/GHSA-3j3q-wp9x-585prefgithub.com/kcp-dev/kcp/releases/tag/v0.29.3refgithub.com/kcp-dev/kcp/releases/tag/v0.30.3