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Description

When Calico is configured with the Azure IPAM plugin, the Calico CNI binary mutates the incoming CNI configuration to attach subnet information before delegating to the IPAM plugin. After mutating, the Azure IPAM helper logs the entire unmarshaled configuration map (stdinData) at INFO level to /var/log/calico/cni/cni.log on every CNI ADD and DEL invocation — once per pod scheduled or terminated on the node. When the cluster is deployed using token-based Kubernetes authentication, this log entry contains the ServiceAccount token, client key, and certificate authority in plaintext. Any principal with read access to /var/log/calico/cni/cni.log on a node can read these logs and extract the credentials, which grant cluster-wide Calico networking admin privileges.

PUBLISHED Reserved 2026-04-17 | Published 2026-05-28 | Updated 2026-05-28 | Assigner Tigera




MEDIUM: 6.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L

Problem types

CWE-532 Insertion of sensitive information into log file

Product status

Default status
affected

Any version before 3.32.0
affected

Default status
affected

Any version before 3.21.7
affected

3.22.0 (semver) before 3.22.3
affected

Default status
affected

Any version before 22.4.0
affected

Credits

Behnam Shobiri finder

Behnam Shobiri remediation developer

Anthony Tam remediation reviewer

Matt Dupre remediation reviewer

Casey Davenport remediation verifier

References

github.com/projectcalico/calico/pull/12502 patch

github.com/projectcalico/calico/pull/12527 patch

github.com/projectcalico/calico/pull/12526 patch

www.tigera.io/security-bulletins/tta-2026-002/ vendor-advisory

cve.org (CVE-2026-41185)

nvd.nist.gov (CVE-2026-41185)

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