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CVE-2026-39429

Kcp broken access control

8.2 HIGHPublic exploitEPSS 0.54%
  1. Published8 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products

Kcp≥ 0.30.0 < 0.30.3 · < 0.29.3

Remediation

Fixed in
Kcp≥ 0.30.3

References

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Frequently asked

Is CVE-2026-39429 being actively exploited?

CVE-2026-39429 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.54%.

How severe is CVE-2026-39429?

CVE-2026-39429 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 0.54% probability of exploitation.

Which products are affected by CVE-2026-39429?

Affected products include Kcp.

How do I fix CVE-2026-39429?

Upgrade affected software to a fixed version, for example Kcp 0.30.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39429 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.