CVE-2026-6720: Tigera Calico

High severity, CVSS 7.2. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Tigera Calico: before 3.32.0 (fixed in 3.32.0)
• Tigera Calico Cloud: before 22.4.0 (fixed in 22.4.0)
• Tigera Calico Enterprise: before 3.21.7 (fixed in 3.21.7)

Published 2026-05-28. Last modified 2026-06-17.