---
cve: "CVE-2026-55997"
severity: "HIGH"
cvss: 8.8
epss: "8%"
vendor: "Rancher"
kev: false
exploited: false
published: "2026-08-05 08:16:34"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T08:38:38+02:00"
---

# CVE-2026-55997

> 8.8 HIGH · 🧪 PoC

## Beschreibung

Rancher issues long-lived registration tokens to authenticate nodes and agents joining a downstream cluster. These tokens were stored and exposed in plaintext with no expiration, so a malicious user could obtain one either through the Rancher API, etcd, stored automation, or direct file access on a node, and could use it at any time to register a rogue node into the cluster.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

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

## Referenzen

- <https://github.com/rancher/rancher/security/advisories/GHSA-7r53-jvhg-9jq4>
- <https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55997>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55997) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_