CVE-2021-43818

Published: 13 December 2021

lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, the HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5 to receive a patch. There are no known workarounds available.

Priority

Cvss 3 Severity Score

7.1

Score breakdown

Status

Package	Release	Status
lxml Launchpad, Ubuntu, Debian	jammy	Released (4.7.1-1)
	upstream	Needs triage
	bionic	Released (4.2.1-1ubuntu0.6)
	focal	Released (4.5.0-1ubuntu0.5)
	hirsute	Released (4.6.3-1ubuntu0.2)
	impish	Released (4.6.3+dfsg-0.1ubuntu0.2)
	trusty	Released (3.3.3-1ubuntu0.2+esm5) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	xenial	Released (3.5.0-1ubuntu0.4+esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)

Severity score breakdown

Parameter	Value
Base score	7.1
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Changed
Confidentiality	Low
Integrity impact	Low
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

References

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