Debian Security Advisory

DLA-3032-1 pngcheck -- LTS security update

Date Reported:
29 May 2022
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 976350.
In Mitre's CVE dictionary: CVE-2020-27818.
More information:

A flaw was found in the check_chunk_name() function of pngcheck, a tool to  verify the integrity of PNG, JNG and MNG files. This flaw allows an attacker who can pass a malicious file to be processed by pngcheck to cause a temporary denial of service.

For Debian 9 stretch, this problem has been fixed in version 2.3.0-7+deb9u1.

We recommend that you upgrade your pngcheck packages.

For the detailed security status of pngcheck please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: