CVE-2026-55998
Published:August 05, 2026
Updated:August 06, 2026
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 Packages
https://github.com/rancher/rancher.git (GITHUB):
Affected version(s) >=v2.14.0 <v2.14.4Fix Suggestion:
Update to version v2.14.4https://github.com/rancher/rancher.git (GITHUB):
Affected version(s) >=v2.13.0 <v2.13.8Fix Suggestion:
Update to version v2.13.8https://github.com/rancher/rancher.git (GITHUB):
Affected version(s) >=v2.11.0 <v2.11.16Fix Suggestion:
Update to version v2.11.16https://github.com/rancher/rancher.git (GITHUB):
Affected version(s) >=v2.12.0 <v2.12.12Fix Suggestion:
Update to version v2.12.12Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Observable Response Discrepancy
EPSS
Base Score:
0.21