CVE-2026-41066

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

Published: Apr 24, 2026Updated: Apr 27, 2026 Sources: CVE List NVDCWE-611

7.5HIGH

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:NIntegrity

None

A:NAvailability

None

Open in CVSS calculator →

Weaknesses

CWE-611

Affected Products

lxml

oss-projectaka lxml/lxml

lxmlLibrary

OSS Libraries / generic-library

Exploitability

Workaround Available

Is your org exposed to CVE-2026-41066?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques

Collection

Initial Access

View detailed technique mapping

References

https://github.com/lxml/lxml/security/advisories/GHSA-vfmq-68hx-4jfw

github.com

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

bugs.launchpad.net

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-41066 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows