What is CVE-2026-41066?

CVE-2026-41066 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files

Which CVE IDs does CVE-2026-41066 cover?

CVE-2026-41066 covers the following CVE IDs: CVE-2026-41066. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-41066?

CVE-2026-41066 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-41066?

CVE-2026-41066 affects 4 products, including: azl3 python-lxml 4.9.3-1 on Azure Linux 3.0; azl3 python-lxml 4.9.3-2 on Azure Linux 3.0; cbl2 python-lxml 4.9.1-1 on CBL Mariner 2.0; cbl2 python-lxml 4.9.1-1 on CBL-Mariner 2.0.

CVE-2026-41066HighCVSS 7.5

lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-41066 →

🎯 Affected products4

azl3 python-lxml 4.9.3-1 on Azure Linux 3.0
azl3 python-lxml 4.9.3-2 on Azure Linux 3.0
cbl2 python-lxml 4.9.1-1 on CBL Mariner 2.0
cbl2 python-lxml 4.9.1-1 on CBL-Mariner 2.0

✅ Remediation

KBRelease Notes (Security Update) KBCBL-Mariner Releases (Security Update) — fixed build 4.9.3-2

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41066
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade