PT-2026-66490 · Tigera · Calico+2

Anthony Tam + 3 · CVE-2026-41187 · Published 2026-07-30 · Updated 2026-07-30

Mitre

CVSS v4.0

6.2

Medium

Base vector

AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:L/SA:H

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.

Fix

Incorrect Authorization

Improper Authorization

Weakness Enumeration

CWE-863

CWE-285

Related Identifiers

CVE-2026-41187

Affected Products

Calico

Calico Cloud

Calico Enterprise

References · 6

• https://github.com/projectcalico/calico/pull/12735 · Patch
• https://github.com/projectcalico/calico/pull/12737 · Patch
• https://github.com/projectcalico/calico/pull/12731 · Patch
• https://github.com/projectcalico/calico/pull/12736 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-41187 · Security Note
• https://tigera.io/security-bulletins/tta-2026-006 · Vendor Advisory