CVE-2026-41066 PUBLISHED

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

Assigner: GitHub_M
Reserved: 16.04.2026 Published: 24.04.2026 Updated: 24.04.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	lxml
Product	lxml
Versions	Version < 6.1.0 is affected

References

Problem Types

CWE-611: Improper Restriction of XML External Entity Reference CWE