In DjVuLibre 3.5.27, DjVmDir.cpp in the DJVU reader component allows attackers to cause a denial-of-service (application crash in GStringRep::strdup in libdjvu/GString.cpp caused by a heap-based buffer over-read) by crafting a DJVU file.
https://www.debian.org/security/2021/dsa-5032
https://usn.ubuntu.com/4198-1/
https://sourceforge.net/p/djvu/djvulibre-git/ci/970fb11a296b5bbdc5e8425851253d2c5913c45e/
https://sourceforge.net/p/djvu/bugs/296/
https://security.gentoo.org/glsa/202007-36
https://lists.debian.org/debian-lts-announce/2021/05/msg00022.html
https://lists.debian.org/debian-lts-announce/2019/08/msg00036.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00087.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00086.html