lxml up to 6.0.x xml external entity reference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.2$0-$5k0.00

Summaryinfo

A vulnerability was found in lxml up to 6.0.x. It has been classified as problematic. The affected element is an unknown function. This manipulation causes xml external entity reference. This vulnerability is tracked as CVE-2026-41066. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in lxml up to 6.0.x. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a xml external entity reference vulnerability. The CWE definition for the vulnerability is CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-41066 since 04/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 310526 (Linux Distros Unpatched Vulnerability : CVE-2026-41066), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (310526) and CERT Bund (WID-SEC-2026-1219). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • SUSE Linux
  • SUSE openSUSE
  • Open Source lxml

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Xml external entity reference
CWE: CWE-611 / CWE-610
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 310526
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-41066

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: lxml 6.1.0

Timelineinfo

04/16/2026 CVE reserved
04/24/2026 +8 days Advisory disclosed
04/24/2026 +0 days VulDB entry created
07/06/2026 +73 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-vfmq-68hx-4jfw
Status: Confirmed

CVE: CVE-2026-41066 (🔒)
GCVE (CVE): GCVE-0-2026-41066
GCVE (VulDB): GCVE-100-359497
CERT Bund: WID-SEC-2026-1219 - lxml: Schwachstelle ermöglicht Offenlegung von Informationen

Entryinfo

Created: 04/24/2026 20:42
Updated: 07/06/2026 04:16
Changes: 04/24/2026 20:42 (63), 04/28/2026 07:23 (2), 07/06/2026 04:16 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!