SUSE Manager: Null Pointer, Enumeration in Systemtemplate PrivateRegistry
CVE-2026-55998 Published on August 5, 2026
Cluster Existence Oracle via Unauthenticated Import Endpoint
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.
Vulnerability Analysis
CVE-2026-55998 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
Observable Response Discrepancy
The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere. This issue frequently occurs during authentication, where a difference in failed-login messages could allow an attacker to determine if the username is valid or not. These exposures can be inadvertent (bug) or intentional (design).
Products Associated with CVE-2026-55998
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Affected Versions
SUSE Rancher:- Version 2.14.0 and below 2.14.4 is affected.
- Version 2.13.0 and below 2.13.8 is affected.
- Version 2.12.0 and below 2.12.12 is affected.
- Version 2.11.0 and below 2.11.16 is affected.