Vulnerability in Rancher

CVE-2026-55997

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.4th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-55997: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

  • Rancher — versions 2.14.0, 2.13.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-55997?
CVE-2026-55997 is a high-severity vulnerability in Rancher, classified under Cleartext Storage of Sensitive Information. CVSS score: 8.8/10. Published 2026-08-05.
How severe is CVE-2026-55997?
High severity. CVSS v3 base score is 8.8 out of 10.