https://seclists.org/oss-sec/2026/q1/355: Fwd: [CPython][CVE-2026-4519] webbrowser.open() API allows leading dashes
Published Mar 20, 2026
·Updated
Affected Software
1 affected component
Python CPython
Frequently Asked Questions
1
What is the severity of CVE-2026-4519?
CVE-2026-4519 has a MEDIUM severity rating.
2
What is the impact of CVE-2026-4519?
CVE-2026-4519 allows the webbrowser.open() API to accept leading dashes, potentially leading to unexpected command behavior.
3
How do I fix CVE-2026-4519?
To fix CVE-2026-4519, users should update to the latest version of CPython where the vulnerability is patched.
4
Which version of Python is affected by CVE-2026-4519?
CVE-2026-4519 affects CPython versions that utilize the webbrowser.open() API with leading dashes.
5
Is there a workaround for CVE-2026-4519?
A workaround for CVE-2026-4519 involves avoiding input to the webbrowser.open() API that contains leading dashes until an update is applied.