CVE-2026-41187

Description

Calico's apiserver wraps tier-scoped resources so that every operation runs through AuthorizeTierOperation, but the Delete override on NetworkPolicy, GlobalNetworkPolicy, and their staged variants is not invoked for DeleteCollection requests. A user holding the deletecollection verb or wildcard verbs on tier-scoped policy resources can bulk-delete policies in tiers they otherwise have no rights on, breaking the tier authorization boundary.

References

• https://github.com/projectcalico/calico/pull/12731
• https://github.com/projectcalico/calico/pull/12735
• https://github.com/projectcalico/calico/pull/12736
• https://github.com/projectcalico/calico/pull/12737
• https://www.tigera.io/security-bulletins/tta-2026-006/