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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

Medium

Cvss 3 Severity Score

7.1

Score breakdown

Status

Package Release Status
lxml
Launchpad, Ubuntu, Debian
jammy
Released (4.7.1-1)
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)
upstream Needs triage

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