CVE-2026-41184: ServiceAccount token disclosure via install-cni container logs

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-28 · updated 2026-10-26
Weakness: CWE-532

Description

In Calico, the install-cni init container logs the rendered CNI configuration to standard output. When the configuration template uses the __SERVICEACCOUNT_TOKEN__ placeholder (Canal/Flannel-Calico deployments), the installer substitutes the live Kubernetes ServiceAccount bearer token before logging, exposing the token to any authenticated user with pods/log permission in the namespace with calico-node. The token holds patch privileges on pods/status, enabling annotation-based attacks against cluster workloads. The default kubeconfig-based authentication path is not affected. This is a direct regression of TTA-2018-001.

Affected products

Tigera Calico: before 3.21.7; before 3.32.0; before 22.4.0; from 3.22.0 before 3.22.3 — fixed in 3.21.7, 3.32.0, 22.4.0, 3.22.3

How to fix

Upgrade to a fixed version: Tigera Calico 3.21.7, 3.32.0, 22.4.0, 3.22.3. Check the vendor advisory for mitigations.

References

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