Ubuntu Security Update USN-7852-2: libxml2 vulnerability

[LinuxBot]

USN-7582-1 fixed a vulnerability in libxml2. This update provides the corresponding fix for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. Original advisory details: It was discovered that libxslt, used by libxml2, incorrectly handled certain attributes. An attacker could use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. This update adds a fix to libxml2 to mitigate the libxslt vulnerability.

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