CVE-2026-19672
MediumCVSS 6.3Summary
The tarfile module in Python has a vulnerability in its extraction filters that allows creating directories outside the destination for members whose name leaves the destination and returns to it (e.g., ../evil/../dest/sub/file). The issue affects only POSIX platforms and creates only empty directories outside the destination.
Risk Assessment
An attacker could exploit this to create unexpected directories on the filesystem, potentially leading to system clutter or security issues if directories are created in sensitive locations.
Recommendation
Upgrade Python to a patched version and avoid extracting untrusted tar archives.
Original NVD description (English source)
The tarfile module's tar and data extraction filters created directories outside the destination for members whose name leaves the destination and returns to it, such as ../evil/../dest/sub/file. The containment check used the resolved path, but intermediate directories were created from the name as given. Only empty directories are created outside the destination. Member contents are still extracted inside it. To return to the destination the member's name must contain the destination directory's own final component, so extraction into a secure randomised directory is not affected. This affects POSIX platforms only. On Windows, .. components are collapsed before the path reaches the filesystem, so the directories outside the destination are never created.