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

CAO 7.5CVE-2026-41066 · GHSA-vfmq-68hx-4jfw · PYSEC-2026-87 · Công bố 24/04/2026 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2026-41066 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng lxml, lxml (lxml).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.32%, cao hơn 25.5% các lỗ hổng khác.
Cách xử lý: cập nhật lên 6.1.0 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
lxml PyPI	`< 6.1.0`	`6.1.0`
lxml lxml	`< 6.1.0`	`6.1.0`

Mô tả

Impact

Using either of the two parsers in the default configuration (with resolve_entities=True) allows untrusted XML input to read local files.

Patches

lxml 6.1.0 changes the default to resolve_entities='internal', thus disallowing local file access by default.

Workarounds

Setting the resolve_entities option explicitly to resolve_entities='internal' or resolve_entities=False disables the local file access.

Resources

Original report: https://bugs.launchpad.net/lxml/+bug/2146291

The default option was changed to resolve_entities='internal' for the normal XML and HTML parsers in lxml 5.0. The default was not changed for iterparse() and ETCompatXMLParser() at the time. lxml 6.1 makes the safe option the default for all parsers.

Mô tả của NVD

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.