TI-2026-29705 Aliases CVE-2026-41066 GHSA-vfmq-68hx-4jfw

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

LOW 39CWE-611Published 2026-04-24 · Updated 2026-04-24

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Partial Red Hat: 14 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-611 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00324 25th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial lxml (lxml): 6.1.0lxml (PyPI): 6.1.0Red Hat: 14 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
lxml	lxml	before 6.1.0	6.1.0	Patch available	CNA
—	lxml (PyPI)	before 6.1.0	6.1.0	Patch available	GHSA-vfmq-68hx-4jfw

lxml Vendorlxml Affected before 6.1.0 Fixed in 6.1.0 Patch available CNA
lxml (PyPI) Vendor— Affected before 6.1.0 Fixed in 6.1.0 Patch available GHSA-vfmq-68hx-4jfw

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:lxml:lxml::::::::	before 6.1.0	Vulnerable	lxml

cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:* Versions before 6.1.0 Vulnerable ·lxml

Remediation

Fix · CNA lxml (lxml) Fixed in 6.1.0
Fix · GHSA-vfmq-68hx-4jfw lxml (PyPI) Fixed in 6.1.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Migration Toolkit for Applications 8	Affected	No fix yet: Fix deferred
Pen Drive Powered by Red Hat Lightspeed	Affected	No fix yet: Fix deferred
Red Hat AI Inference Server	Affected	No fix yet: Fix deferred
Red Hat Ansible Automation Platform 2	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred
Red Hat OpenShift Container Platform 4	Affected	No fix yet: Fix deferred
Red Hat Quay 3	Affected	No fix yet: Fix deferred
Red Hat Satellite 6	Affected	No fix yet: Fix deferred
Red Hat Update Infrastructure 4 for Cloud Providers	Affected	No fix yet: Fix deferred

Not affected: 1 product

Red Hat Hardened Images

Timeline

2026-10-02 Threatist record created from CVE-2026-41066
2026-10-03 Alias added: GHSA-vfmq-68hx-4jfw

References

Exploit 1

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

Advisory 2

Other 3

TI-2021-19624 HTML Cleaner allows crafted and SVG embedded scripts to pass through CVSS 3.1HIGH 8.2
TI-2022-02132 NULL Pointer Dereference in lxml/lxml CVSS 3.1HIGH 7.5
TI-2014-02511 Incomplete blacklist vulnerability in the lxml.html.clean module in lxml before 3.3.5… CVSS 3.1MEDIUM 6.1
TI-2021-09882 An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. CVSS 3.1MEDIUM 6.1
TI-2020-16868 Cross-site scripting in python-lxml CVSS 3.1MEDIUM 6.1
TI-2018-14010 An issue was discovered in lxml before 4.2.5. CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences