{"id":"CVE-2026-55998","state":"PUBLISHED","title":"Cluster Existence Oracle via Unauthenticated Import Endpoint","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.","publishedAt":"2026-08-05T07:51:21.731Z","updatedAt":"2026-08-05T13:13:02.031Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","source":"suse"},"assigner":"suse","products":["SUSE Rancher"],"affected":[{"vendor":"SUSE","product":"Rancher","packageName":"Rancher","defaultStatus":"unaffected","versions":[{"version":"2.14.0","status":"affected","lessThan":"2.14.4","versionType":"semver"},{"version":"2.13.0","status":"affected","lessThan":"2.13.8","versionType":"semver"},{"version":"2.12.0","status":"affected","lessThan":"2.12.12","versionType":"semver"},{"version":"2.11.0","status":"affected","lessThan":"2.11.16","versionType":"semver"}]}],"references":["https://github.com/rancher/rancher/security/advisories/GHSA-23h9-rr79-r3gh","https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55998"],"weaknesses":["CWE-204"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55998.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55998","state":"PUBLISHED","datePublished":"2026-08-05T07:51:21.731Z","dateUpdated":"2026-08-05T13:13:02.031Z","assignerShortName":"suse","assignerOrgId":"404e59f5-483d-4b8a-8e7a-e67604dd8afb","dateReserved":"2026-06-18T09:26:55.988Z"},"containers":{"cna":{"title":"Cluster Existence Oracle via Unauthenticated Import Endpoint","descriptions":[{"lang":"en","value":"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":[{"vendor":"SUSE","product":"Rancher","packageName":"Rancher","defaultStatus":"unaffected","versions":[{"version":"2.14.0","status":"affected","lessThan":"2.14.4","versionType":"semver"},{"version":"2.13.0","status":"affected","lessThan":"2.13.8","versionType":"semver"},{"version":"2.12.0","status":"affected","lessThan":"2.12.12","versionType":"semver"},{"version":"2.11.0","status":"affected","lessThan":"2.11.16","versionType":"semver"}]}],"references":[{"url":"https://github.com/rancher/rancher/security/advisories/GHSA-23h9-rr79-r3gh"},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55998"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":5.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-204","lang":"en","description":"CWE-204 Observable response discrepancy","type":"CWE"}]}],"providerMetadata":{"shortName":"suse","orgId":"404e59f5-483d-4b8a-8e7a-e67604dd8afb","dateUpdated":"2026-08-05T07:51:21.731Z"},"credits":[{"lang":"en","value":"This vulnerability was discovered and reported by Michael Wollner (@ibonok) from Deutsche Telekom AG.","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-05T13:11:15.281747Z","id":"CVE-2026-55998","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-05T13:13:02.031Z"}}]}}}