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.

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.

EPSS: 0.001 (0.2th percentile) — read the EPSS interpretation.

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.

Affected products

Rancher — versions 2.14.0, 2.13.0

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

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.