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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-3087
StatePUBLISHED
AssignerPSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-27 21:16:42 UTC
Updated2026-06-05 00:25:35 UTC
DescriptionIf `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.

Risk And Classification

Primary CVSS: v4.0 6 MEDIUM from [email protected]

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:X/V:X/RE:X/U:X

EPSS: 0.001500000 probability, percentile 0.352400000 (date 2026-06-09)

Problem Types: CWE-22 | CWE-22 CWE-22

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6MEDIUMCVSS: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/C...
4.0CNACVSS6MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
Low
User Interaction
None
Confidentiality
None
Integrity
High
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Microsoft Windows - All All All
Application Python Python 3.15.0 alpha1 All All
Application Python Python 3.15.0 alpha2 All All
Application Python Python 3.15.0 alpha3 All All
Application Python Python 3.15.0 alpha4 All All
Application Python Python 3.15.0 alpha5 All All
Application Python Python 3.15.0 alpha6 All All
Application Python Python 3.15.0 alpha7 All All
Application Python Python 3.15.0 alpha8 All All
Application Python Python All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Python Software Foundation CPython affected 3.14.5rc1 python Not specified
CNA Python Software Foundation CPython affected 3.15.0a1 3.15.0b1 python Not specified

References

ReferenceSourceLinkTags
github.com/python/cpython/commit/ba0aca3bffce431fe2fbd53ca4cd6a717a2e2c19 [email protected] github.com Patch
github.com/python/cpython/commit/65b255416ae217bf0e22085be3c1976cea18bd8c [email protected] github.com Patch
github.com/python/cpython/commit/8ee6aff14054b37b53e47194a2fa313e98163c94 [email protected] github.com Patch
github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4 [email protected] github.com Patch
github.com/python/cpython/issues/146581 [email protected] github.com Exploit, Issue Tracking, Patch, Vendor Advisory
mail.python.org/archives/list/[email protected]/thread/X6FXE5C6KDK... [email protected] mail.python.org Mailing List, Vendor Advisory
github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840 [email protected] github.com Patch
github.com/python/cpython/pull/146591 [email protected] github.com Issue Tracking, Patch
github.com/python/cpython/commit/8e13025747e1ca72e86d1f35637123f9c306f0cb [email protected] github.com Patch
github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd [email protected] github.com Patch
www.openwall.com/lists/oss-security/2026/04/28/9 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Serhiy Storchaka (https://github.com/serhiy-storchaka) (en)

CNA: Seth Larson (https://github.com/sethmlarson) (en)

CNA: GGAutomaton (https://github.com/GGAutomaton) (en)

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report