[USN-5225-1] lxml vulnerability

Leonidas S. Barbosa leo.barbosa at canonical.com
Wed Jan 12 14:30:37 UTC 2022

Ubuntu Security Notice USN-5225-1
January 12, 2022

lxml vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM


lxml could be made to execute arbitrary code if it received a specially crafted XML
or HTML file.

Software Description:
- lxml: pythonic binding for the libxml2 and libxslt libraries


It was discovered that lxml incorrectly handled certain XML and HTML files.
An attacker could possibly use this issue to execute arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.10:
  python3-lxml                    4.6.3+dfsg-0.1ubuntu0.2

Ubuntu 21.04:
  python3-lxml                    4.6.3-1ubuntu0.2

Ubuntu 20.04 LTS:
  python-lxml                     4.5.0-1ubuntu0.5
  python3-lxml                    4.5.0-1ubuntu0.5

Ubuntu 18.04 LTS:
  python-lxml                     4.2.1-1ubuntu0.6
  python3-lxml                    4.2.1-1ubuntu0.6

Ubuntu 16.04 ESM:
  python-lxml                     3.5.0-1ubuntu0.4+esm2
  python3-lxml                    3.5.0-1ubuntu0.4+esm2

Ubuntu 14.04 ESM:
  python-lxml                     3.3.3-1ubuntu0.2+esm5
  python3-lxml                    3.3.3-1ubuntu0.2+esm5

In general, a standard system update will make all the necessary changes.


Package Information:
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