CVE-2026-44885
Description
Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. From 2.33.0 to before 2.33.8, Portainer's backup restore feature accepts a .tar.gz archive and extracts it to a target directory on the server. The extraction function (ExtractTarGz in api/archive/targz.go) constructed output paths using filepath.Clean(filepath.Join(outputDirPath, header.Name)). This combination does not prevent directory traversal — a tar entry named ../../etc/cron.d/evil resolves to a path outside the extraction root, so a crafted archive can write files to arbitrary locations on the server filesystem. This vulnerability is fixed in 2.33.8.
How to fix
- portainer portainer2.33.8 or later
- github.com/portainer/portainer2.33.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| portainer portainer | 2.33.0 ≤ v < 2.33.8 | 2.33.8 |
| github.com/portainer/portainerGo | 2.33.0 ≤ v < 2.33.8, No range specified | 2.33.8 |
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