CVE-2026-55998Cluster Existence Oracle via Unauthenticated Import Endpoint
Updated under an hour ago ()
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It affects SUSE Rancher. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-204
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- suse
- NVD analysis
- Awaiting Analysis
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
SUSE Rancher suse:rancher (from the name) | from 2.14.0 before 2.14.4; from 2.13.0 before 2.13.8; from 2.12.0 before 2.12.12; from 2.11.0 before 2.11.16 | CNA record |
References
- https://github.com/rancher/rancher/security/advisories/GHSA-23h9-rr79-r3gh
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55998
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.