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CVE-2026-41066

Lxml XML external entity (XXE)

7.5 HIGHPublic exploitEPSS 0.32%
  1. Published24 Apr 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Lxml< 6.1.0

Remediation

Fixed in
Lxml≥ 6.1.0

References

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Frequently asked

Is CVE-2026-41066 being actively exploited?

CVE-2026-41066 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.32%.

How severe is CVE-2026-41066?

CVE-2026-41066 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.32% probability of exploitation.

Which products are affected by CVE-2026-41066?

Affected products include Lxml.

How do I fix CVE-2026-41066?

Upgrade affected software to a fixed version, for example Lxml 6.1.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.