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Vulnerability record · CVE-2026-3087 · published 27 April 2026

CVE-2026-3087: Python path traversal vulnerability

Python · Python

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.

6.0 CVSS 4.0 Medium EPSS 0.55% · top 53.4% CWE-22 · Path traversal
6.0CVSS 4.0 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References, 1 tagged exploit
26 Oct 2026Last modified by NVD

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:4.0/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/python/cpython/commit/1071290169f85c09cf767c1099564a9426cdc7e8
https://github.com/python/cpython/commit/65b255416ae217bf0e22085be3c1976cea18bd8c Patch
https://github.com/python/cpython/commit/7ef7dd0a74f47facd1fadcbc77f8fb03beb5eb4d
https://github.com/python/cpython/commit/8e13025747e1ca72e86d1f35637123f9c306f0cb Patch
https://github.com/python/cpython/commit/8ee6aff14054b37b53e47194a2fa313e98163c94 Patch
https://github.com/python/cpython/commit/a6650a2cdf0c49fb8ce0c982903aa2aa274beefe
https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840 Patch
https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd Patch
https://github.com/python/cpython/commit/ba0aca3bffce431fe2fbd53ca4cd6a717a2e2c19 Patch
https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4 Patch
https://github.com/python/cpython/issues/146581 ExploitIssue TrackingPatchVendor Advisory
https://github.com/python/cpython/pull/146591 Issue TrackingPatch
https://mail.python.org/archives/list/security-announce@python.org/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/ Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/28/9 Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-3087), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.