CVE-2026-39429
CVE-2026-39429 is a high-severity vulnerability in Kcp with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-302.
Key facts
- Severity: High (CVSS 3.x base score 8.2)
- EPSS exploit prediction: 0% (35th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20607
- Weakness: CWE-302
- Affected product: Kcp
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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 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.
- How severe is CVE-2026-39429?
- CVE-2026-39429 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
- Is CVE-2026-39429 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-39429?
- CVE-2026-39429 affects Kcp. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-39429?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-39429 have an EU (EUVD) identifier?
- Yes. CVE-2026-39429 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20607.
- When was CVE-2026-39429 published?
- CVE-2026-39429 was published on 2026-04-08 and last updated on 2026-06-17.
References
- https://github.com/kcp-dev/kcp/releases/tag/v0.29.3
- https://github.com/kcp-dev/kcp/releases/tag/v0.30.3
- https://github.com/kcp-dev/kcp/security/advisories/GHSA-3j3q-wp9x-585p
Affected products (1)
- cpe:2.3:a:kcp:kcp:*:*:*:*:*:*:*:*
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