CVE-2026-41066 HIGH

CVE-2026-41066: lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files

Vendor Lxml
Product lxml
Weakness CWE-611 · XXE
Published April 24, 2026
Last update April 24, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.0, using either of the two parsers in the default configuration (with resolve_entities=True) allows untrusted XML input to read local files. Setting the resolve_entities option explicitly to resolve_entities='internal' or resolve_entities=False disables the local file access. This vulnerability is fixed in 6.1.0.

Key dates

02Disclosure timeline

April 24, 2026 CVE published
April 24, 2026 Record updated