CVE-2026-55998

Cluster Existence Oracle via Unauthenticated Import Endpoint

Published Aug 5, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Suse
Suse rancher
Vendors & Products Suse
Suse rancher
Type Values Removed Values Added
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.
Title Cluster Existence Oracle via Unauthenticated Import Endpoint
Weaknesses CWE-204
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
suse
Published
Updated
Aug 5, 2026, 1:13 PM
Reserved
Jun 18, 2026, 9:26 AM
Status
Awaiting Analysis
Published
Aug 5, 2026, 8:16 AM
Modified
Oct 24, 2026, 4:10 PM