# CVE-2026-55998

## Summary

- **CVE ID:** CVE-2026-55998
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
- **CWE:** CWE-204
- **Published:** Aug 5, 2026
- **Last Modified:** Aug 5, 2026

## Description

The endpoint /v3/import/{token}_{clusterId}.yaml retrieves the cluster object before validating the token. When a valid cluster ID references a cluster that has private registry secrets configured, a nil pointer dereference in pkg/systemtemplate/private_registry.go causes the request to return HTTP 502 Bad Gateway. For cluster IDs that do not exist, the endpoint returns HTTP 200. This observable difference in response codes constitutes a reliable enumeration oracle.

## Affected Products

- SUSE — Rancher (2.14.0)
- SUSE — Rancher (2.13.0)
- SUSE — Rancher (2.12.0)
- SUSE — Rancher (2.11.0)

## References

- [CNA](https://github.com/rancher/rancher/security/advisories/GHSA-23h9-rr79-r3gh)
- [CNA](https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55998)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 10.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._