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CVE-2026-41187

Calico Tier Authorization Bypass via DeleteCollection

MEDIUM
6.5
CVSS Score
Published: July 30, 2026 at 02:45 PM UTC
Updated: August 8, 2026 at 01:29 AM UTC
2 products affected across 2 vendorsCalicoCalico Enterprise

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Calico· Calico
95%
v ≤ 22.4.0v < 22.4.0v < 3.21.7v < 3.31.63.22.0 ≤ v < 3.22.43.32.0 ≤ v < 3.32.13.32.0
Affected range stops below 22.4.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.21.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.22.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.31.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.32.1, so it looks safe — our inference, not a vendor statement
Calico Enterprise· Tigera
60%
v < 3.21.73.22.0 ≤ v < 3.22.53.22.0
Affected range stops below 3.21.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.22.5, so it looks safe — our inference, not a vendor statement

References (5)

PatchIssue Tracking
Source: cverecord
https://github.com/projectcalico/calico/pull/12731
PatchIssue Tracking
Source: cverecord
https://github.com/projectcalico/calico/pull/12735
PatchIssue Tracking
Source: cverecord
https://github.com/projectcalico/calico/pull/12736
PatchIssue Tracking
Source: cverecord
https://github.com/projectcalico/calico/pull/12737
Vendor Advisory
Source: cverecord
https://www.tigera.io/security-bulletins/tta-2026-006/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-285CWE-863

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