CVE-2026-41187
Calico Tier Authorization Bypass via DeleteCollection
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.
INFO
Published Date :
July 30, 2026, 3:16 p.m.
Last Modified :
Aug. 8, 2026, 1:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-41187
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | e6d453f4-3dae-4941-bcea-9af25f4e824d | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Invoke authorization checks for DeleteCollection requests.
- Update apiserver to enforce tier authorization boundaries.
- Review and adjust policy resource access controls.
- Test bulk delete operations thoroughly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-41187.
| URL | Resource |
|---|---|
| https://github.com/projectcalico/calico/pull/12731 | Issue Tracking Patch |
| https://github.com/projectcalico/calico/pull/12735 | Issue Tracking Patch |
| https://github.com/projectcalico/calico/pull/12736 | Issue Tracking Patch |
| https://github.com/projectcalico/calico/pull/12737 | Issue Tracking Patch |
| https://www.tigera.io/security-bulletins/tta-2026-006/ | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-41187 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-41187
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-41187 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-41187 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:tigera:calico:*:*:*:*:enterprise:*:*:* versions up to (excluding) 3.21.7 *cpe:2.3:a:tigera:calico:*:*:*:*:open_source:*:*:* versions up to (excluding) 3.31.6 *cpe:2.3:a:tigera:calico:*:*:*:*:open_source:*:*:* versions from (including) 3.32.0 up to (excluding) 3.32.1 *cpe:2.3:a:tigera:calico:*:*:*:*:cloud:*:*:* versions up to (including) 22.4.0 *cpe:2.3:a:tigera:calico:*:*:*:*:enterprise:*:*:* versions from (including) 3.22.0 up to (excluding) 3.22.4 Added Reference Type Tigera, Inc.: https://github.com/projectcalico/calico/pull/12731 Types: Issue Tracking, Patch Added Reference Type Tigera, Inc.: https://github.com/projectcalico/calico/pull/12735 Types: Issue Tracking, Patch Added Reference Type Tigera, Inc.: https://github.com/projectcalico/calico/pull/12736 Types: Issue Tracking, Patch Added Reference Type Tigera, Inc.: https://github.com/projectcalico/calico/pull/12737 Types: Issue Tracking, Patch Added Reference Type Tigera, Inc.: https://www.tigera.io/security-bulletins/tta-2026-006/ Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 30, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-41187', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-30T16:11:20.822241Z'} -
New CVE Received by [email protected]
Jul. 30, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Tigera', 'product': 'Calico', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.31.6', 'versionType': 'semver'}, {'status': 'affected', 'version': '3.32.0', 'lessThan': '3.32.1', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Tigera', 'product': 'Calico Enterprise', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.21.7', 'versionType': 'semver'}, {'status': 'affected', 'version': '3.22.0', 'lessThan': '3.22.5', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Tigera', 'product': 'Calico Cloud', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '22.4.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:L/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-285 Added CWE CWE-863 Added Reference https://github.com/projectcalico/calico/pull/12731 Added Reference https://github.com/projectcalico/calico/pull/12735 Added Reference https://github.com/projectcalico/calico/pull/12736 Added Reference https://github.com/projectcalico/calico/pull/12737 Added Reference https://www.tigera.io/security-bulletins/tta-2026-006/