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CVE-2026-41066

27
FAUCET Score

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.

First published: Apr 24, 2026Last modified: Apr 24, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 6.1.0CPE matchmatch criteria
cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.32%
Probability of exploitation in next 30 days
EPSS Percentile
24.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0032 is in the 7th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: azl3 python-lxml 4.9.3-1 on Azure Linux 3.0Fixed in: 4.9.3-2
microsoftpatch availablevia msrc
Product: azl3 python-lxml 4.9.3-2 on Azure Linux 3.0Fixed in: 4.9.3-2
microsoftpatch availablevia msrc
Product: 21239-17084Fixed in: 4.9.3-2
microsoftpatch availablevia msrc
Product: 21313-17084Fixed in: 4.9.3-2
pippatch availablevia ghsa
Product: lxmlFixed in: 6.1.0
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (2)

pipGHSA-vfmq-68hx-4jfwhigh

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

Apr 21, 2026
microsoft2026-Apr/CVE-2026-41066Important

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

Apr 14, 2026

References

bugs.launchpad.net / lxml/+bug/2146291
ExploitIssue TrackingThird Party Advisory
github.com / lxml/lxml/security/advisories/GHSA-vfmq-68hx-4jfw
MitigationVendor Advisory