CVE-2026-8643

Arbitrary file write via entry-point path traversal

Published Jun 1, 2026 · Updated Jun 1, 2026

Path traversal in Python Packaging Authority pip 24.0 through 26.1.1 allows local users to write scripts outside the installation directory. PipScriptMaker passed untrusted console_scripts or gui_scripts names to distlib, which joined them to the scripts directory without rejecting separators, .. components, or absolute paths. Exploitation requires an authorized user to install a crafted package; the resulting write carries only that user's filesystem permissions.

CVSS severity4.1
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Python Packaging Authority pip 24.0 through 26.1.1 allows local users to write scripts outside the installation directory. PipScriptMaker passed untrusted console_scripts or gui_scripts names to distlib, which joined them to the scripts directory without rejecting separators, .. components, or absolute paths. Exploitation requires an authorized user to install a crafted package; the resulting write carries only that user's filesystem permissions.

The record

CVE
CVE-2026-8643
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Python Packaging Authority
Product
pip
Classifications
CWE-22, T1204.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.1.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Python Packaging Authority · pipversion=0 <26.1.2

Published CVSS scores

4.1Python Software FoundationCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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