Medium severity · published Aug 5, 2026
CVE-2026-55998
Cluster Existence Oracle via Unauthenticated Import Endpoint
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RA
Rancher · SUSE
2.14.0 before 2.14.4; 2.13.0 before 2.13.8; 2.12.0 before 2.12.12; 2.11.0 before 2.11.16 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55998
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55998
bugzilla.suse.com
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55998
github.com
https://github.com/rancher/rancher/security/advisories/GHSA-23h9-rr79-r3gh
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