Ubuntu Security Update USN-6658-2: libxml2 vulnerability

[LinuxBot]

USN-6658-1 fixed a vulnerability in libxml2. This update provides the corresponding updates for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. Original advisory details: It was discovered that libxml2 incorrectly handled certain XML documents. A remote attacker could possibly use this issue to cause libxml2 to crash, resulting in a denial of service, or possibly execute arbitrary code.

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