CVE-2026-54250
Description
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.
Summary dbcve.org
K3s contains a path traversal vulnerability in its etcd snapshot decompression functionality. When an administrator restores a compressed etcd snapshot archive, maliciously crafted zip file entries with path traversal sequences (e.g., ../../../etc/passwd) can write files to arbitrary locations outside the intended snapshot directory.
Mitigation
Upgrade K3s to version 1.35.3+k3s1, 1.34.6+k3s1, or v1.33.10+k3s1 or later. Until patched, only restore etcd snapshots from trusted sources.