CVE-2026-3087
shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
- State
- Published
- Severity
- 6.0 Medium
- Published
- Apr 27, 2026
- Updated
- Aug 13, 2026
- Reserved
- Feb 23, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.0 Medium | 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 | PSF |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
CPythonPython Software Foundation |
|
References
- https://github.com/python/cpython/pull/146591patch
- https://github.com/python/cpython/issues/146581issue-tracking
- https://mail.python.org/archives/list/security-announce@python.org/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/vendor-advisory
- https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840patch
- https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fdpatch
- https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4patch
- https://github.com/python/cpython/commit/65b255416ae217bf0e22085be3c1976cea18bd8cpatch
- https://github.com/python/cpython/commit/8e13025747e1ca72e86d1f35637123f9c306f0cbpatch
- https://github.com/python/cpython/commit/8ee6aff14054b37b53e47194a2fa313e98163c94patch
- https://github.com/python/cpython/commit/ba0aca3bffce431fe2fbd53ca4cd6a717a2e2c19patch
- https://github.com/python/cpython/commit/a6650a2cdf0c49fb8ce0c982903aa2aa274beefepatch
- https://github.com/python/cpython/commit/7ef7dd0a74f47facd1fadcbc77f8fb03beb5eb4dpatch
- https://github.com/python/cpython/commit/1071290169f85c09cf767c1099564a9426cdc7e8patch
- http://www.openwall.com/lists/oss-security/2026/04/28/9
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