CVE-2021-43818

Publication date 13 December 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
lxml	22.04 LTS jammy	Fixed 4.7.1-1
	21.10 impish	Fixed 4.6.3+dfsg-0.1ubuntu0.2
	21.04 hirsute	Fixed 4.6.3-1ubuntu0.2
	20.04 LTS focal	Fixed 4.5.0-1ubuntu0.5
	18.04 LTS bionic	Fixed 4.2.1-1ubuntu0.6
	16.04 LTS xenial	Fixed 3.5.0-1ubuntu0.4+esm2 Ubuntu Pro
	14.04 LTS trusty	Fixed 3.3.3-1ubuntu0.2+esm5 Ubuntu Pro

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro

Severity score breakdown

Parameter	Value
Base score	7.1 · High
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

Related Ubuntu Security Notices (USN)

USN-5225-1
lxml vulnerability
12 January 2022