What is CVE-2026-41187?

CVE-2026-41187 is a medium-severity vulnerability in Tigera Calico, classified under Improper Authorization. CVSS score: 6.5/10. Published 2026-07-30.

How severe is CVE-2026-41187?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Tigera Calico

CVE-2026-41187

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.

EPSS: 0.002 (12.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Tigera Calico — versions 0, 3.32.0
Tigera Calico Cloud — versions 0
Tigera Calico Enterprise — versions 0, 3.22.0

Weakness classification (CWE)

References

psirt@tigera.io (Patch, patch, Issue Tracking)
psirt@tigera.io (Patch, patch, Issue Tracking)
psirt@tigera.io (Patch, patch, Issue Tracking)
psirt@tigera.io (Patch, patch, Issue Tracking)
psirt@tigera.io (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-41187?: CVE-2026-41187 is a medium-severity vulnerability in Tigera Calico, classified under Improper Authorization. CVSS score: 6.5/10. Published 2026-07-30.
How severe is CVE-2026-41187?: Medium severity. CVSS v3 base score is 6.5 out of 10.