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Vulnerabilities CVE-2026-6720

CVE-2026-6720

High
Open
TLP:CLEAR

Calicoctl leaks cluster credentials to stderr when verbose logging is enabled

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Description

When calicoctl is invoked with --log-level=info or --log-level=debug, the client prints the full contents of its loaded connection-configuration struct to stderr in a single log line. The struct embeds every credential calicoctl uses to talk to the cluster — inline kubeconfig (with bearer token), Kubernetes API bearer token, etcd password, and inline PEM-encoded etcd client certificate and key. Any reader of that stderr stream — CI job logs, session-recording archives, shared support-ticket transcripts, or local filesystem viewers on the host that ran calicoctl — can extract these credentials with zero Kubernetes privilege. calicoctl's default log level is panic, so this issue only triggers when verbose logging is explicitly enabled.

Details

CVSS Score
7.2
EPSS Score
0.22%

13.2th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
Confidence
90%
Published
May 28, 2026
Last Modified
May 28, 2026
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