CVE-2026-39429

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

Published 8 Apr 2026Modified 24 Jul 2026CWE 302, 862

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

GHSA8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by GHSA (high).

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.

Affected packages and fixed versions

Source	Package	Fixed in
chainguard	kcp-0.29, kcp-0.30, kcp-fips-0.29 and 1 more	0.29.3-r2 and 1 more
go::GitHub Security Advisory Go	github.com/kcp-dev/kcp	0.30.3, 0.29.3

Show all 5 entries from 2 sources

Source	Package	Fixed in
chainguard	kcp-0.29	0.29.3-r2
chainguard	kcp-0.30	0.30.3-r0
chainguard	kcp-fips-0.29	0.29.3-r2
chainguard	kcp-fips-0.30	0.30.3-r0
go::GitHub Security Advisory Go	github.com/kcp-dev/kcp	0.30.3, 0.29.3

References

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FindsEvery admitted image is rescanned every 24 hours by default (scan.rescanInterval). When Trivy rates this vulnerability critical for the image's package source, it appears in the image's findings by name. Findings without a fix are left out unless includeUnfixed is on.
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RefusesWith a policy that blocks critical findings, a pod with this image is refused at admission, a rollback to it included. Pods already running are not evicted.
RecordsEach decision is recorded with the policy that ran and its hash, then sealed under a signed checkpoint.

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Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.