CVE-2026-19672

Technical Description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References