A libPGF security update has been released for Ubuntu Linux 16.04 LTS.

USN-4554-1: libPGF vulnerability

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Ubuntu Security Notice USN-4554-1
September 28, 2020

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

- Ubuntu 16.04 LTS

Summary:

libPGF could be made to crash if it opened a specially crafted
file.

Software Description:
- libpgf: Progressive Graphics File (PGF) library

Details:

It was discovered that libPGF lacked proper validation when opening a
specially crafted PGF file. An attacker could possibly use this issue to
cause a denial of service.

Update instructions:

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

Ubuntu 16.04 LTS:
libpgf6 6.14.12-3.1ubuntu0.1

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

References:
  https://usn.ubuntu.com/4554-1
CVE-2015-6673

Package Information:
  https://launchpad.net/ubuntu/+source/libpgf/6.14.12-3.1ubuntu0.1