Path Traversal in Portainer
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 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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.008 (55.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002
Affected products
- Portainer — versions >= 2.33.0, < 2.33.8
Weakness classification (CWE)
References
- github.com/portainer/portainer/security/advisories/GHSA-m8fg-67j7-cx4v (Exploit, Third Party Advisory)
- github.com/portainer/portainer-suite/pull/1875 (Broken Link)
Frequently asked questions
- What is CVE-2026-44885?
- CVE-2026-44885 is a medium-severity vulnerability in Portainer, classified under Path Traversal. CVSS score: 5.5/10. Published 2026-05-28.
- How severe is CVE-2026-44885?
- Medium severity. CVSS v3 base score is 5.5 out of 10.