CVE-2026-6720

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.

Source: NVD

References

• [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-6720
• [Other]https://github.com/projectcalico/calico/pull/12535
• [Other]https://github.com/projectcalico/calico/pull/12536
• [Other]https://github.com/projectcalico/calico/pull/12537
• [Other]https://www.tigera.io/security-bulletins/tta-2026-003/

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