What is CVE-2026-4519?

CVE-2026-4519 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. webbrowser.open() allows leading dashes in URLs

Which CVE IDs does CVE-2026-4519 cover?

CVE-2026-4519 covers the following CVE IDs: CVE-2026-4519. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-4519?

CVE-2026-4519 affects 3 products, including: azl3 python3 3.12.9-10 on Azure Linux 3.0; azl3 python3 3.12.9-9 on Azure Linux 3.0; cbl2 python3 3.9.19-19 on CBL Mariner 2.0.

CVE-2026-4519High

webbrowser.open() allows leading dashes in URLs

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-4519 →

🎯 Affected products3

azl3 python3 3.12.9-10 on Azure Linux 3.0
azl3 python3 3.12.9-9 on Azure Linux 3.0
cbl2 python3 3.9.19-19 on CBL Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 3.12.9-10 KBCBL-Mariner Releases (Security Update) — fixed build 3.9.19-20

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4519
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade