CVE-2026-55998

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 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-25)

CWE

CWE-204

Published

2026-08-05

Modified

2026-10-24

Record from

the NVD, synced 2026-10-24

References

• https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55998
• https://github.com/rancher/rancher/security/advisories/GHSA-23h9-rr79-r3gh

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