CVE-2026-3087

medium

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.

References

Advisories
More

https://mail.python.org/archives/list/[email protected]/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/

http://www.openwall.com/lists/oss-security/2026/04/28/9

https://github.com/python/cpython/pull/146591

https://github.com/python/cpython/issues/146581

https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4

https://github.com/python/cpython/commit/ba0aca3bffce431fe2fbd53ca4cd6a717a2e2c19

https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd

https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840

https://github.com/python/cpython/commit/8ee6aff14054b37b53e47194a2fa313e98163c94

https://github.com/python/cpython/commit/8e13025747e1ca72e86d1f35637123f9c306f0cb

https://github.com/python/cpython/commit/65b255416ae217bf0e22085be3c1976cea18bd8c

Details

Source: Mitre, NVD

Published: 2026-04-27

Updated: 2026-06-05

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

Severity: High

CVSS v3

Base Score: 7.5

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

Severity: High

CVSS v4

Base Score: 6

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00046