Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 59.2%
CVSS Severity
CVSS v3 Score 5.5
References
Products affected by CVE-2026-44885
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cpe:2.3:a:portainer:portainer:2.33.0
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cpe:2.3:a:portainer:portainer:2.33.1
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cpe:2.3:a:portainer:portainer:2.33.2
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cpe:2.3:a:portainer:portainer:2.33.3
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cpe:2.3:a:portainer:portainer:2.33.4
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cpe:2.3:a:portainer:portainer:2.33.5
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cpe:2.3:a:portainer:portainer:2.33.6
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cpe:2.3:a:portainer:portainer:2.33.7