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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/portainer/portainerGo | >= 2.33.0, < 2.33.8 | 2.33.8 |
Affected products
3Patches
Vulnerability mechanics
References
6- github.com/portainer/portainer/security/advisories/GHSA-m8fg-67j7-cx4vnvdExploitThird Party AdvisoryWEB
- github.com/advisories/GHSA-m8fg-67j7-cx4vghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-44885ghsaADVISORY
- github.com/portainer/portainer-suite/pull/1875nvdBroken LinkWEB
- github.com/portainer/portainer/commit/e02ae6b2fb69668d1cd7d07cb873dfcdd9cf1e42ghsaWEB
- github.com/portainer/portainer/releases/tag/2.33.8ghsaWEB
News mentions
1- Portainer CE: Nine CVEs Disclosed in a Single Day — Two Critical, Seven High/MediumVypr Intelligence · May 28, 2026