What’s Vulnerable › Vulnerabilities

CVE-2026-55997: Long-lived Rancher registration token exposed in plaintext

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-09-01
• Weakness: CWE-312

Description

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.

Affected products

• Rancher: from 2.14.0 before 2.14.4; from 2.13.0 before 2.13.8 — fixed in 2.13.8, 2.14.4

How to fix

Upgrade to a fixed version: Rancher 2.13.8, 2.14.4. Check the vendor advisory for mitigations.

References

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

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