Python CPython ZIP Archive shutil.unpack_archive path traversal

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Python CPython. It has been declared as critical. Affected by this vulnerability is the function shutil.unpack_archive of the component ZIP Archive Handler. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2026-3087. The attack can be executed remotely. There is not any exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Python CPython (version now known). Affected by this issue is the function shutil.unpack_archive of the component ZIP Archive Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-3087 since 02/24/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25922). Once again VulDB remains the best source for vulnerability data.

Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.7

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: github.com

Timelineinfo

02/24/2026 CVE reserved
04/27/2026 +61 days Advisory disclosed
04/27/2026 +0 days VulDB entry created
05/17/2026 +20 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 146581
Status: Confirmed

CVE: CVE-2026-3087 (🔒)
GCVE (CVE): GCVE-0-2026-3087
GCVE (VulDB): GCVE-100-359876
EUVD: 🔒

Entryinfo

Created: 04/27/2026 23:44
Updated: 05/17/2026 10:10
Changes: 04/27/2026 23:44 (70), 04/28/2026 01:26 (1), 05/17/2026 10:10 (11)
Complete: 🔍
Cache ID: 216::103

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