CVE-2017-17522: Python

High severity, CVSS 8.8. EPSS: 3.6% chance of exploitation in the next 30 days.

Lib/webbrowser.py in Python through 3.6.3 does not validate strings before launching the program specified by the BROWSER environment variable, which might allow remote attackers to conduct argument-injection attacks via a crafted URL. NOTE: a software maintainer indicates that exploitation is impossible because the code relies on subprocess.Popen and the default shell=False setting

Affected products

• Python Python: up to and including 3.6.3

Published 2017-12-14. Last modified 2026-06-17.