CPython shutil.unpack_archive ZIP Path Traversal on Windows
CVE-2026-3087 Published on April 27, 2026
shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.
Weakness Type
What is a Directory traversal Vulnerability?
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2026-3087 has been classified to as a Directory traversal vulnerability or weakness.
Products Associated with CVE-2026-3087
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