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CVE-2026-40491 — gdown Affected by Arbitrary File Write via Path Traversal in gdown.extractall

Affected: wkentaro gdown

gdown is a Google Drive public file/folder downloader. Versions prior to 5.2.2 are vulnerable to a Path Traversal attack within the extractall functionality. When extracting a maliciously crafted ZIP or TAR archive, the library fails to sanitize or validate the filenames of the archive members. This allow files to be written outside the intended destination directory, potentially leading to arbitrary file overwrite and Remote Code Execution (RCE). Version 5.2.2 contains a fix.

GHSA-76hw-p97h-883f — gdown Affected by Arbitrary File Write via Path Traversal in gdown.extractall

Affected: PyPI: gdown

### Summary The gdown library (tested on v5.2.1) is vulnerable to a Path Traversal attack within its extractall functionality. When extracting a maliciously crafted ZIP or TAR archive, the library fails to sanitize or validate the filenames of the archive members. This allow files to be written outside the intended destination directory, potentially leading to arbitrary file overwrite and Remote Code Execution (RCE).

### Details The vulnerability exists in `gdown/extractall.py` within the `extractall()` function. The function takes an archive path and a destination directory (`to`), then calls the underlying `extractall()` method of Python's `tarfile` or `zipfile` modules without validating whether the archive members stay within the `to` boundary.

Vulnerable Code: ``` # gdown/extractall.py def extractall(path, to=None): # ... (omitted) ... with opener(path, mode) as f: f.extractall(path=to) # Vulnerable: No path validation or filters` ``` Even on modern Python versions (3.12+), if the `filter` parameter is not explicitly set or if the library's wrapper logic bypasses modern protections, path traversal remains possible as demonstrated in the PoC.

### PoC ## Steps to Reproduce

1. Create the Malicious Archive (`poc.py`): ``` import tarfile import io import os

# Create a target directory os.makedirs("./safe_target/subfolder", exist_ok=True)

# Generate a TAR file containing a member with path traversal with tarfile.open("evil.tar", "w") as tar: # Targ…

PYSEC-2026-2158

Affected: PyPI: gdown