GHSA-vfmq-68hx-4jfw

Suggest an improvement
Source
https://github.com/advisories/GHSA-vfmq-68hx-4jfw
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-vfmq-68hx-4jfw/GHSA-vfmq-68hx-4jfw.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-vfmq-68hx-4jfw
Aliases
  • CVE-2026-41066
Downstream
Related
Published
2026-04-21T20:38:44Z
Modified
2026-04-22T19:14:11.857152423Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files
Details

Impact

Using either of the two parsers in the default configuration (with resolve_entities=True) allows untrusted XML input to read local files.

Patches

lxml 6.1.0 changes the default to resolve_entities='internal', thus disallowing local file access by default.

Workarounds

Setting the resolve_entities option explicitly to resolve_entities='internal' or resolve_entities=False disables the local file access.

Resources

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

The default option was changed to resolve_entities='internal' for the normal XML and HTML parsers in lxml 5.0. The default was not changed for iterparse() and ETCompatXMLParser() at the time. lxml 6.1 makes the safe option the default for all parsers.

Database specific 
{
    "github_reviewed_at": "2026-04-21T20:38:44Z",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-611"
    ],
    "nvd_published_at": null,
    "severity": "HIGH"
}
References

Affected packages

PyPI / lxml

Package

Name
lxml
View open source insights on deps.dev
Purl
pkg:pypi/lxml

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.0

Affected versions

1.*
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6
2.*
2.0
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.0.9
2.0.10
2.0.11
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.2.8
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
3.*
3.0
3.0.2
3.1.0
3.1.1
3.1.2
3.2.0
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.3.0
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.4.0
3.4.1
3.4.2
3.4.3
3.4.4
3.5.0
3.6.0
3.6.1
3.6.2
3.6.3
3.6.4
3.7.0
3.7.1
3.7.2
3.7.3
3.8.0
4.*
4.0.0
4.1.0
4.1.1
4.2.0
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.3.0
4.3.2
4.3.3
4.3.4
4.3.5
4.4.0
4.4.1
4.4.2
4.4.3
4.5.0
4.5.1
4.5.2
4.6.0
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.1
4.8.0
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
5.*
5.0.0
5.0.1
5.0.2
5.1.0
5.1.1
5.2.0
5.2.1
5.2.2
5.3.0
5.3.1
5.3.2
5.4.0
6.*
6.0.0
6.0.1
6.0.2
6.0.3
6.0.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-vfmq-68hx-4jfw/GHSA-vfmq-68hx-4jfw.json"