5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-44885

CVE-2026-44885: Portainer: Path traversal in backup archive extraction allows arbitrary file write

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.

(GitHub Advisory)

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CVE-2026-44885

CVE-2026-44885:

5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation NoneAutomatable NoTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/portainer/portainer	go	>= 2.33.0, < 2.33.8	2.33.8

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a path traversal issue within Portainer's backup restore feature. The root cause is the insecure handling of file paths during the extraction of .tar.gz archives. The function archive.ExtractTarGz located in api/archive/targz.go uses the standard filepath.Join and filepath.Clean functions to determine the destination of extracted files. However, this combination does not prevent directory traversal attacks. An attacker with administrator privileges can upload a specially crafted backup archive containing relative path components (e.g., ../). When Portainer restores this backup, the vulnerability can be triggered to write files to arbitrary locations on the server's filesystem, outside of the intended extraction directory. This could lead to remote code execution, for example, by writing a cron job or an SSH authorized key. The patch replaces the insecure path construction with a custom filesystem.JoinPaths function, which ensures that the final path is always within the intended destination directory, thus mitigating the vulnerability.

Vulnerable functions

archive.ExtractTarGz

api/archive/targz.go

The function `ExtractTarGz` in `api/archive/targz.go` is vulnerable to path traversal. It uses `filepath.Clean(filepath.Join(outputDirPath, header.Name))` to construct the destination path for extracted files. An attacker can craft a malicious tar archive containing file paths with `../` sequences (e.g., `../../etc/passwd`). This would cause files to be written outside the intended `outputDirPath`, leading to an arbitrary file write vulnerability.

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Miggo AI

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WAF Rule

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Reasoning

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