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EUVD-2026-330746

2026-10-15T01:12:19.274157+00:00

EUVD-2026-330746

fkie_cve-2026-54250

2026-10-15T01:12:19.274187+00:00

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.

GHSA-jxr7-mqhw-9p98 — K3s: ZIP Archive Path Traversal Vulnerability in etcd Snapshot Decompression

2026-10-15T01:12:19.274218+00:00

Affected: Go: github.com/k3s-io/k3s

#### Summary

A path traversal vulnerability exists in K3s's etcd snapshot decompression functionality. Zip files containing archive members with maliciously crafted names (e.g., `../../../../etc/password`) can be written to arbitrary locations on the filesystem when an administrator restores the archive as a compressed etcd snapshot.

#### Mitigations

* Enable golang's built-in [insecure path protections](https://pkg.go.dev/archive/zip#NewReader) when restoring snapshots by setting the`GODEBUG` environment variable: ```bash GODEBUG=zipinsecurepath=0 k3s server --cluster-reset --cluster-reset-restore-path=/path/to/snapshot.zip ``` * Manually extract the snapshot from the zip archive before restoring it. If the snapshot to be restored does not end with `.zip`, the vulnerable extraction code will not be executed.

#### Additional Notes

Administrators should be aware of the cautions noted in the "Security" section of the documentation on [Restoring Snapshots](https://docs.k3s.io/cli/etcd-snapshot#security).