CVE-2026-44885
Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and …
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/portainer/portainer | >= 2.33.0, < 2.33.8 | 2.33.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Portainer | Portainer | from 2.33.0 before 2.33.8 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-m8fg-67j7-cx4v
- https://github.com/portainer/portainer/security/advisories/GHSA-m8fg-67j7-cx4v
- https://github.com/portainer/portainer/commit/e02ae6b2fb69668d1cd7d07cb873dfcdd9cf1e42
- https://github.com/portainer/portainer/releases/tag/2.33.8
- https://nvd.nist.gov/vuln/detail/CVE-2026-44885
- https://github.com/portainer/portainer-suite/pull/1875