Tigera Calico/Calico Enterprise/Calico Cloud prior 3.32.0 Kubernetes Authentication cni.log log file

Summaryinfo

A vulnerability was found in Tigera Calico, Calico Enterprise and Calico Cloud. It has been rated as problematic. This issue affects some unknown processing of the file /var/log/calico/cni/cni.log of the component Kubernetes Authentication. The manipulation leads to log file. This vulnerability is documented as CVE-2026-41185. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Tigera Calico, Calico Enterprise and Calico Cloud. It has been rated as problematic. This issue affects an unknown function of the file /var/log/calico/cni/cni.log of the component Kubernetes Authentication. The manipulation with an unknown input leads to a log file vulnerability. Using CWE to declare the problem leads to CWE-532. Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information. Impacted is confidentiality. The summary by CVE is:

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.

The weakness was released by Behnam Shobiri. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-41185 since 04/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

By approaching the search of inurl:var/log/calico/cni/cni.log it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 3.32.0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Cloud Software

Vendor

• Tigera

Name

• Calico
• Calico Cloud
• Calico Enterprise

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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