Vulnerability · Published May 28, 2026 · Assigned by Tigera
CVE-2026-41185ServiceAccount token disclosure via Azure IPAM CNI plugin logs
Medium 6.0
In plain English
A medium-severity sensitive data in logs in Calico from Tigera. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/projectcalico/calico | 3.31.6 | GHSA-m67g-87rx-v42c |
| Go | github.com/projectcalico/calico | 1.11.0-cni-plugin.0.20260417001138-cd73bc2cea0f | GHSA-m67g-87rx-v42c |
| Go | github.com/projectcalico/calico | 1.11.0-cni-plugin.0.20260417001138-cd73bc2cea0f | GO-2026-5891 |
| Go | github.com/projectcalico/calico/v3 | no fix listed | GO-2026-5891 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Tigera | Calico | 0 – before 3.32.0 |
| Tigera | Calico Enterprise | 0 – before 3.21.73.22.0 – before 3.22.3 |
| Tigera | Calico Cloud | 0 – before 22.4.0 |
Weakness: CWE-532 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L