CVE-2026-3087
shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
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.
INFO
Published Date :
April 27, 2026, 9:16 p.m.
Last Modified :
May 13, 2026, 4:27 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 28c92f92-d60d-412d-b760-e73465c3df22 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Python to a secure version.
- Validate archive extraction paths on Windows.
- Avoid extracting untrusted archives on Windows.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-3087.
| URL | Resource |
|---|---|
| https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840 | Patch |
| https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd | Patch |
| https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4 | Patch |
| https://github.com/python/cpython/issues/146581 | Exploit Issue Tracking Patch Vendor Advisory |
| https://github.com/python/cpython/pull/146591 | Issue Tracking Patch |
| https://mail.python.org/archives/list/[email protected]/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/ | Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/04/28/9 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3087 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-3087
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-3087 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3087 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Added CPE Configuration AND OR *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions up to (including) 3.14.4 *cpe:2.3:a:python:python:3.15.0:alpha_1:*:*:*:*:*:* *cpe:2.3:a:python:python:3.15.0:alpha_2:*:*:*:*:*:* *cpe:2.3:a:python:python:3.15.0:alpha_3:*:*:*:*:*:* *cpe:2.3:a:python:python:3.15.0:alpha_4:*:*:*:*:*:* *cpe:2.3:a:python:python:3.15.0:alpha_5:*:*:*:*:*:* *cpe:2.3:a:python:python:3.15.0:alpha_6:*:*:*:*:*:* *cpe:2.3:a:python:python:3.15.0:alpha_7:*:*:*:*:*:* *cpe:2.3:a:python:python:3.15.0:alpha_8:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/04/28/9 Types: Mailing List, Third Party Advisory Added Reference Type Python Software Foundation: https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840 Types: Patch Added Reference Type Python Software Foundation: https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd Types: Patch Added Reference Type Python Software Foundation: https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4 Types: Patch Added Reference Type Python Software Foundation: https://github.com/python/cpython/issues/146581 Types: Exploit, Issue Tracking, Patch, Vendor Advisory Added Reference Type Python Software Foundation: https://github.com/python/cpython/pull/146591 Types: Issue Tracking, Patch Added Reference Type Python Software Foundation: https://mail.python.org/archives/list/[email protected]/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/ Types: Mailing List, Vendor Advisory -
CVE Modified by [email protected]
Apr. 29, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840 Added Reference https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd Added Reference https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Apr. 28, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/28/9 -
New CVE Received by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-22 Added Reference https://github.com/python/cpython/issues/146581 Added Reference https://github.com/python/cpython/pull/146591 Added Reference https://mail.python.org/archives/list/[email protected]/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/