# CVE-2026-41187: Calico Tier Authorization Bypass via DeleteCollection

> Attackers with deletecollection permissions can bypass tier authorization to bulk-delete network policies in unauthorized tiers, compromising network segmentation.

- **Severity:** Medium 6.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:L/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Jul 2026
- **Updated:** 30 Jul 2026
- **Also known as:** GHSA-38w4-qxg9-xg36, MINI-3mmh-24jq-3q2c, MINI-7795-vxv8-gq89, MINI-7v2v-qpww-5x6r, MINI-gfjx-66hv-vmw9, MINI-jvgj-h44q-4mj3, MINI-qr34-xfp4-6374, MINI-x3j9-crg5-f7mv, MINI-xw89-rg86-cqgr

## What is CVE-2026-41187?

CVE-2026-41187 is a medium-severity missing authorization vulnerability in Tigera Calico, published on 30 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official 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.

Weakness: CWE-863 (Incorrect Authorization), CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2026-41187?

It affects 1 product.


Products: Tigera Calico.

## How do I fix CVE-2026-41187?

Apply the vendor's patch.

## Is CVE-2026-41187 being exploited?

There is no known exploitation of CVE-2026-41187 in the wild and no public exploit code.

## Other vulnerabilities in Tigera Calico

- [CVE-2026-6540](https://insights.sbomify.com/CVE-2026-6540/): L7 policy bypass via unnormalized HTTP path matching (high 7.9)
- [CVE-2026-41186](https://insights.sbomify.com/CVE-2026-41186/): Unauthenticated Go pprof exposure in Calico debug server (medium 6.0)
- [CVE-2026-41184](https://insights.sbomify.com/CVE-2026-41184/): ServiceAccount token disclosure via install-cni container logs (medium 6.0)
- [CVE-2026-41185](https://insights.sbomify.com/CVE-2026-41185/): ServiceAccount token disclosure via Azure IPAM CNI plugin logs (medium 6.0)
- [CVE-2022-28224](https://insights.sbomify.com/CVE-2022-28224/): Calico and Calico Enterprise may be vulnerable to route hijacking with the floating IP feature (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41187 and fix it if it is affected.

What it is: CVE-2026-41187 is a medium-severity missing authorization vulnerability in Tigera Calico, published on 30 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-41187 in the wild and no public exploit code.

Affected product: Tigera Calico. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-41187/ (Markdown: https://insights.sbomify.com/CVE-2026-41187/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41187
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41187
- OSV: https://osv.dev/vulnerability/CVE-2026-41187

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41187/
Summaries are generated and may contain mistakes; the official description above is the record.