[USN-4896-1] lxml vulnerability

========================================================================== Ubuntu Security Notice USN-4896-1 March 30, 2021
lxml vulnerability ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS – Ubuntu 16.04 LTS
lxml could allow cross-site scripting (XSS) attacks.
Software Description: – lxml: pythonic binding for the libxml2 and libxslt libraries
It was discovered that lxml incorrectly handled certain HTML attributes. A remote attacker could possibly use this issue to perform cross-site scripting (XSS) attacks.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10: python3-lxml 4.5.2-1ubuntu0.4
Ubuntu 20.04 LTS: python-lxml 4.5.0-1ubuntu0.3 python3-lxml 4.5.0-1ubuntu0.3
Ubuntu 18.04 LTS: python-lxml 4.2.1-1ubuntu0.4 python3-lxml 4.2.1-1ubuntu0.4
Ubuntu 16.04 LTS: python-lxml 3.5.0-1ubuntu0.4 python3-lxml 3.5.0-1ubuntu0.4
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-4896-1 CVE-2021-28957
Package Information: launchpad.net/ubuntu/+source/lxml/4.5.2-1ubuntu0.4 launchpad.net/ubuntu/+source/lxml/4.5.0-1ubuntu0.3 launchpad.net/ubuntu/+source/lxml/4.2.1-1ubuntu0.4 launchpad.net/ubuntu/+source/lxml/3.5.0-1ubuntu0.4