CVE-2026-13346

Received Received - Intake

Path Traversal in pip Package Manager

Publication date: 2026-07-29

Last updated on: 2026-07-29

Assigner: Python Software Foundation

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-29

Last Modified

2026-07-29

Generated

2026-07-30

AI Q&A

2026-07-30

EPSS Evaluated

N/A

NVD

CVE-2026-13346

Affected Vendors & Products

Vendor	Product	Version / Range
python	pip	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-36	The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as "/abs/path" that can resolve to a location that is outside of that directory.

Attack-Flow Graph

Executive Summary

pip incorrectly handles doubly-encoded package URLs from indexes, allowing files to be installed to arbitrary disk locations even when installing wheels. This requires downloading or installing a package from a malicious index to succeed.

Detection Guidance

This vulnerability can be detected by checking pip logs for suspicious package installations or downloads. Look for packages installed from untrusted indexes or with doubly-encoded URLs. Review pip configuration files for untrusted index URLs.

Impact Analysis

An attacker could trick pip into installing files outside intended directories, potentially overwriting system files or executing malicious code if combined with other vulnerabilities. Only affects users running pip download with --only-binary.

Mitigation Strategies

Avoid using the `--only-binary` option with pip download from untrusted indexes. Only install packages from trusted package indexes. Regularly audit installed packages and their sources. Update pip to the latest version if a patch is available.

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