What is CVE-2026-55998?

CVE-2026-55998 is a medium-severity vulnerability in SUSE Rancher, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-08-05.

How severe is CVE-2026-55998?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in SUSE Rancher

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.

EPSS: 0.002 (10.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Suse Rancher — versions 2.14.0, 2.13.0, 2.12.0

Weakness classification (CWE)

CWE-204 — Observable Response Discrepancy

References

Frequently asked questions

What is CVE-2026-55998?: CVE-2026-55998 is a medium-severity vulnerability in SUSE Rancher, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-08-05.
How severe is CVE-2026-55998?: Medium severity. CVSS v3 base score is 5.3 out of 10.