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Vulnerabilities CVE-2026-55998

CVE-2026-55998

Medium
Open
TLP:CLEAR

Cluster Existence Oracle via Unauthenticated Import Endpoint

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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.

Details

CVSS Score
5.3
EPSS Score
0.21%

10.7th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Confidence
90%
Published
Aug 5, 2026
Last Modified
Aug 5, 2026
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