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.
Vulnerability Analysis
CVE-2026-3087 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
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
Want to know whenever a new CVE is published for Cpython? stack.watch will email you.
Affected Versions
Python Software Foundation CPython:- Before 3.13.14 is affected.
- Version 3.14.0a1 and below 3.14.5rc1 is affected.
- Version 3.15.0a1 and below 3.15.0b1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.