K3s: ZIP Archive Path Traversal Vulnerability in etcd Snapshot Decompression
Published Jun 25, 2026 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
K3s: ZIP Archive Path Traversal Vulnerability in etcd Snapshot Decompression
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
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 when restoring snapshots by setting theGODEBUG environment variable: 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.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Jun 25, 2026 · Last refreshed Nov 3, 2026