Shell Spawn from FFmpeg/Jellyfin/Nextcloud Media Process - CVE-2026-8461 RCE

Ibrahim Saud@tektrix

•updated Jun 23, 2026•3•0•9

Detects the spawning of suspicious shell processes (sh, bash, cmd.exe) by media processing applications like ffmpeg, ffprobe, jellyfin-ffmpeg, jellyfin, or nextcloud. This activity is often indicative of an adversary exploiting a vulnerability in these applications to gain initial access or execute arbitrary commands, potentially leading to further compromise. The rule specifically looks for suspicious command-line arguments that suggest interactive shells, network connections, or direct command execution.