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CVE-2026-13346— pip absolute path traversal during download from malicious package indexes

Quick assessment

Affected
Python Packaging Authority pip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Python Packaging Authority pip是Python Packaging Authority组织开源的一个Python包安装程序。 pip 26.2之前版本存在路径遍历漏洞，该漏洞源于未能正确处理双重编码的包URL，可能导致文件被安装到磁盘任意位置。

CVSS 5.6 · Medium EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Python Packaging Authority pip < 26.2 affected
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I. Basic Information for CVE-2026-13346

Vulnerability Information
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Vulnerability Title
pip absolute path traversal during download from malicious package indexes
Source: CVE Program / CVE List V5
Vulnerability Description
pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels. This vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone are not able to exploit this vulnerability. Note that this vulnerability only materially impacts users running `pip download` with the `--only-binary` option as installing source distributions from an untrusted index is already an unsafe operation that executes code during install time.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
绝对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
Python Packaging Authority pip 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python Packaging Authority pip是Python Packaging Authority组织开源的一个Python包安装程序。 pip 26.2之前版本存在路径遍历漏洞，该漏洞源于未能正确处理双重编码的包URL，可能导致文件被安装到磁盘任意位置。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Packaging Authority pip 0 ~ 26.2 -

II. Public POCs for CVE-2026-13346

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III. Intelligence Information for CVE-2026-13346

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Patches & Fixes for CVE-2026-13346 (1)

Vendor Advisories for CVE-2026-13346 (1)

IV. Related Vulnerabilities

Same product: pip
Same vendor: Python Packaging Authority
Same weakness: CWE-36