CVE-2026-41066: lxml is a library for processing XML and HTML in the Python language

Q: How do I fix CVE-2026-41066?

lxml: upgrade to 6.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-41066 being exploited?

CVE-2026-41066 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41066 affect?

CVE-2026-41066 affects lxml. Severity is high (CVSS 7.5). 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 reso

Q: How urgent is CVE-2026-41066?

Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-41066 is a high-severity flaw (CVSS 7.5) affecting lxml. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-611
Published	2026-04-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: lxml

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-24 17:16 UTCPublished CVE record published
2026-06-17 10:46 UTCUpdated Record last modified

lxml lxml UPGRADE

Affected: < 6.1.0

Fixed in: 6.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lxml || rpm -q lxml || lxml --version

2. UPGRADE to 6.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lxml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lxml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41066?

lxml: upgrade to 6.1.0. Exact commands for each OS are on this page.

Is CVE-2026-41066 being exploited?

CVE-2026-41066 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41066 affect?

CVE-2026-41066 affects lxml. Severity is high (CVSS 7.5). 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 reso

How urgent is CVE-2026-41066?

Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

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References

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