Format string vulnerability in panoFileOutputNamesCreate() in libpano13 2.9.20~rc2+dfsg-3 and earlier can lead to read and write arbitrary memory values.
https://sourceforge.net/projects/panotools/files/libpano13/libpano13-2.9.20/
https://security.gentoo.org/glsa/202107-47
https://lists.debian.org/debian-lts-announce/2021/04/msg00010.html