Path Traversal in K3s-Io K3s

CVE-2026-54250

K3s is a fully conformant production-ready Kubernetes distribution. Prior to 1.35.3+k3s1, 1.34.6+k3s1, v1.33.10+k3s1, a path traversal vulnerability exists in K3s's etcd snapshot decompression functionality. Zip files containing archive members with maliciously crafted names can be written to arbitrary locations on the filesystem when an administrator restores the archive as a compressed etcd snapshot. This vulnerability is fixed in 1.35.3+k3s1, 1.34.6+k3s1, v1.33.10+k3s1.

Vulnerability class: Path Traversal (Directory Traversal)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (5.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.5% 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-2026-54250: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

  • K3s-Io K3s — versions >= 1.35.0-rc1+k3s1, < 1.35.3+k3s1, >= 1.34.0-rc1+k3s1, < 1.34.6+k3s1, < 1.33.10+k3s1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-54250?
CVE-2026-54250 is a medium-severity vulnerability in K3s-Io K3s, classified under Path Traversal. CVSS score: 5.8/10. Published 2026-06-25.
How severe is CVE-2026-54250?
Medium severity. CVSS v3 base score is 5.8 out of 10.