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Test your applicationsUpgrade Debian:11 ffmpeg to version 7:2.7.2-1 or higher.
Note: Versions mentioned in the description apply only to the upstream ffmpeg package and not the ffmpeg package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
The sws_init_context function in libswscale/utils.c in FFmpeg before 2.7.2 does not initialize certain pixbuf data structures, which allows remote attackers to cause a denial of service (segmentation violation) or possibly have unspecified other impact via crafted video data.