[Security-announce][CVE-2026-3087] shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs

There is a MEDIUM severity vulnerability affecting CPython.

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.

Please see the linked CVE ID for the latest information on affected versions:

• https://www.cve.org/CVERecord?id=CVE-2026-3087
• https://github.com/python/cpython/pull/146591