---
id: CVE-2026-111728
title: Seanime v3.10.3 Argument Injection via TranscodeHwAccelCustomSettings
summary: >-
  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
  transcodeHwAc…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-88
vendor: 5rahim
product: Seanime
affected:
  - Seanime >= 3.7.0 < 3.10.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T16:32:01.070683Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:06:38.459Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111728'
references:
  - url: >-
      https://github.com/5rahim/seanime/commit/d7b13706da236473f33163b1222eb09587e93388
  - url: 'https://github.com/5rahim/seanime'
  - url: >-
      https://www.vulncheck.com/advisories/seanime-argument-injection-via-transcodehwaccelcustomsettings
    label: >-
      VulnCheck Advisory: Seanime v3.10.3 Argument Injection via
      TranscodeHwAccelCustomSettings
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.841Z'
---

## Overview

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.

## Affected

- `Seanime >= 3.7.0 < 3.10.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.