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CVE-2026-4519

3.3 · LOW

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers.

Published Mar 20, 2026CWE-20EPSS 0.41%

Overview

CVE-2026-4519 is a low-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 3.3 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

The webbrowser.open() API would accept leading dashes in the URL which

could be handled as command line options for certain web browsers. New

behavior rejects leading dashes. Users are recommended to sanitize URLs

prior to passing to webbrowser.open().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/python/cpython/commit/3681d47a440865aead912a054d4599087b4270ddGitHubgithub.com/python/cpython/commit/43fe06b96f6a6cf5cfd5bdab20b8649374956866GitHubgithub.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d73eGitHubgithub.com/python/cpython/commit/594b5a05dc9913880ac92eded440defbf32a28d1GitHubgithub.com/python/cpython/commit/82a24a4442312bdcfc4c799885e8b3e00990f02bGitHubgithub.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4GitHubgithub.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76GitHubgithub.com/python/cpython/commit/96fc5048605863c7b6fd6289643feb0e97edd96cGitHubgithub.com/python/cpython/commit/ad4d5ba32af4d80b0dfa2ba9d8203bfb219e60a5GitHubgithub.com/python/cpython/commit/cbba6119391112aba9c5aebf7b94aea447922c48

How CyberStrike helps

Frequently asked questions

What is CVE-2026-4519?

CVE-2026-4519 is a low-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 3.3 (LOW).

How severe is CVE-2026-4519?

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-4519?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-4519?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-4519 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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