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 v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

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

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-05 08:16

Updated : 2026-09-01 20:54

NVD link : CVE-2026-55998

Mitre link : CVE-2026-55998

CVE.ORG link : CVE-2026-55998

JSON object : View

Products Affected

No product.

CWE

CWE-204

Observable Response Discrepancy

{"id": "CVE-2026-55998", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55998", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-05T13:11:15.281747Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "meissner@suse.de", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "meissner@suse.de", "affectedData": [{"vendor": "SUSE", "product": "Rancher", "versions": [{"status": "affected", "version": "2.14.0", "lessThan": "2.14.4", "versionType": "semver"}, {"status": "affected", "version": "2.13.0", "lessThan": "2.13.8", "versionType": "semver"}, {"status": "affected", "version": "2.12.0", "lessThan": "2.12.12", "versionType": "semver"}, {"status": "affected", "version": "2.11.0", "lessThan": "2.11.16", "versionType": "semver"}], "packageName": "Rancher", "defaultStatus": "unaffected"}]}], "published": "2026-08-05T08:16:34.460", "references": [{"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55998", "source": "meissner@suse.de"}, {"url": "https://github.com/rancher/rancher/security/advisories/GHSA-23h9-rr79-r3gh", "source": "meissner@suse.de"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "meissner@suse.de", "description": [{"lang": "en", "value": "CWE-204"}]}], "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."}], "lastModified": "2026-09-01T20:54:51.287", "sourceIdentifier": "meissner@suse.de"}