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Ubuntu Security Notice USN-4896-2
April 08, 2021

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

- Ubuntu 14.04 ESM

Summary:

lxml could allow cross-site scripting (XSS) attacks.

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

Details:

USN-4896-1 fixed a vulnerability in lxml. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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 14.04 ESM:
  python-lxml                     3.3.3-1ubuntu0.2+esm3
  python3-lxml                    3.3.3-1ubuntu0.2+esm3

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

References:
  https://ubuntu.com/security/notices/USN-4896-2
  https://ubuntu.com/security/notices/USN-4896-1
  CVE-2021-28957