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A gif2apng security update has been released for Ubuntu Linux 16.04 ESM, 18.04 LTS, and 20.04 LTS.

USN-5969-1: gif2apng vulnerabilities

Ubuntu Security Notice USN-5969-1
March 23, 2023

gif2apng vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM


Several security issues were fixed in gif2apng.

Software Description:
- gif2apng: tool for converting animated GIF images to APNG format


It was discovered that gif2apng contained multiple heap-base overflows. An
attacker could potentially exploit this to cause a denial of service (system
crash). (CVE-2021-45909, CVE-2021-45910, CVE-2021-45911)

Update instructions:

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

Ubuntu 20.04 LTS:
gif2apng 1.9+srconly-3ubuntu0.1

Ubuntu 18.04 LTS:
gif2apng 1.9+srconly-2ubuntu0.1

Ubuntu 16.04 ESM:
gif2apng 1.7-3ubuntu0.1~esm1

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

CVE-2021-45909, CVE-2021-45910, CVE-2021-45911

Package Information: