CVE-2026-6720
Calicoctl leaks cluster credentials to stderr when verbose logging is enabled
- Published
- Updated
- Reserved
- Assigned by
- Tigera
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| TigeraCNA (assigner) | 4.0 | High7.2 | 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 |
| NVDNVD · Deferred | 4.0 | High7.2 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Weakness
Affected products
- affected < 3.32.0
- affected < 3.21.7
- unaffected 3.22.3
- affected < 22.4.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/projectcalico/calicoctl/v3GHSA-3m4q-ggcj-j6m4 (opens in a new tab)
References (4)
- https://github.com/projectcalico/calico/pull/12535 (opens in a new tab)patch
- https://github.com/projectcalico/calico/pull/12536 (opens in a new tab)patch
- https://github.com/projectcalico/calico/pull/12537 (opens in a new tab)patch
- https://www.tigera.io/security-bulletins/tta-2026-003/ (opens in a new tab)vendor-advisory
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-3m4q-ggcj-j6m4 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-6720)Record last updated .