CVE-2026-3087: shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs

High severity · published Apr 27, 2026

CVE-2026-3087

shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs

7.5

CVSS

0.6%

EPSS

On KEV

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

High

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.6% · higher than 46% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

CPython · Python Software Foundation

before 3.10.21; 3.11.0 before 3.11.16; 3.12.0 before 3.12.14; 3.13.0 before 3.13.14; 3.14.0a1 before 3.14.5rc1; 3.15.0a1 before 3.15.0b1 · source: vendor

Python · Python

through 3.14.4; 3.15.0; 3.15.0; 3.15.0; 3.15.0; 3.15.0; +3 more · source: NVD

Affected product

CPython

Python Software Foundation

All CPython CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-3087

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-3087

github.com