There is a recently patched RCE vulnerability in ffmpeg. see https://www.securityweek.com/ffmpeg-pixelsmash-flaw-allows-rce-on-video-players-media-servers-nas-appliances/

This very likely impacts most fediverse software, though I don't know how exploitable it is. Hopefully all the various fedi-software publishes updated container images soon with patched versions.