CVE-2026-111728
MediumCVSS 5.4Summary
Seanime v3.7.0 to v3.10.3 contains an argument injection vulnerability reachable through improper authorization, allowing unauthenticated LAN or Tailnet clients to bypass the privileged mediastream settings guard by setting transcodeHwAccel to custom and supplying attacker-controlled decodeFlags and encodeFlags, which are appended verbatim to the ffmpeg argument vector.
Risk Assessment
An attacker can trigger execution via the mediastream and HLS playlist endpoints to achieve arbitrary file write and truncation on the host as the user running seanime, with injected input options also enabling potential arbitrary local file read and outbound data exfiltration.
Recommendation
Update Seanime to a version later than 3.10.3, which fixes this vulnerability.
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Original NVD description (English source)
Seanime v3.7.0 to v3.10.3 contains an argument injection vulnerability reachable through improper authorization, allowing unauthenticated LAN or Tailnet clients to bypass the privileged mediastream settings guard by setting transcodeHwAccel to custom and supplying attacker-controlled decodeFlags and encodeFlags via the transcodeHwAccelCustomSettings field, which are appended verbatim to the ffmpeg argument vector. Attackers can trigger execution via the mediastream request and HLS playlist endpoints to achieve arbitrary file write and file truncation on the host as the user running seanime, with the injected input options also enabling potential arbitrary local file read and outbound data exfiltration through ffmpeg's protocol handlers.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

