USN-4896-1: lxml vulnerability

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• lxml - pythonic binding for the libxml2 and libxslt libraries

Details

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

• python-lxml - 4.5.0-1ubuntu0.3
• python3-lxml - 4.5.0-1ubuntu0.3

Ubuntu 18.04

• python-lxml - 4.2.1-1ubuntu0.4
• python3-lxml - 4.2.1-1ubuntu0.4

Ubuntu 16.04

• 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

• CVE-2021-28957

Related notices

• USN-4896-2: lxml, python-lxml-doc, python3-lxml, python-lxml