CVE-2026-55998

Cluster Existence Oracle via Unauthenticated Import Endpoint

State: Published
Severity: 5.3 Medium
Published: Aug 5, 2026
Updated: Aug 5, 2026
Reserved: Jun 18, 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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	suse

Weaknesses

CWE-204 Observable response discrepancy

Affected Products

Product	Versions
RancherSUSE	2.14.0 to before 2.14.4Affected 2.13.0 to before 2.13.8Affected 2.12.0 to before 2.12.12Affected 2.11.0 to before 2.11.16Affected

References

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