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

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Summary

CVECVE-2026-41066
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 17:16:20 UTC
Updated2026-04-27 17:59:05 UTC
Descriptionlxml 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.000320000 probability, percentile 0.091000000 (date 2026-04-27)

Problem Types: CWE-611 | CWE-611 CWE-611: Improper Restriction of XML External Entity Reference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Lxml Lxml All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Lxml Lxml affected < 6.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/lxml/lxml/security/advisories/GHSA-vfmq-68hx-4jfw [email protected] github.com Mitigation, Vendor Advisory
bugs.launchpad.net/lxml/+bug/2146291 [email protected] bugs.launchpad.net Exploit, Issue Tracking, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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