---
cve: "CVE-2026-55998"
severity: "MEDIUM"
cvss: 5.3
epss: "21%"
vendor: "SUSE"
kev: false
exploited: false
published: "2026-08-05 08:16:34"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T17:35:40+02:00"
---

# CVE-2026-55998

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 79b003279fec8814d9dc5252c5f6d8100a170348 (Commit)
- 853a0e93a1ca67653b80ae9550df98344e4e21c5 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55998) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_