---
id: CVE-2026-73291
title: >-
  Seerr is an open-source media request and discovery manager for Jellyfin,
  Plex, and Emby
summary: >-
  Seerr is an open-source media request and discovery manager for Jellyfin,
  Plex, and Emby. Prior to version 3.4.0, Seerr's ImageProxy in
  server/lib/imageproxy.ts uses the upstream ETag and Content-Type response
  headers to build a cache fi…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H'
cwe:
  - CWE-22
  - CWE-94
published: '2026-08-12'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73291'
references:
  - url: >-
      https://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2
    label: security-advisories@github.com
  - url: 'https://github.com/seerr-team/seerr/releases/tag/v3.4.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00273
epssPercentile: 0.19955
ingestedAt: '2026-09-18T20:51:25.603Z'
---

## Overview

Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Prior to version 3.4.0, Seerr's ImageProxy in server/lib/imageproxy.ts uses the upstream ETag and Content-Type response headers to build a cache filename for the unauthenticated GET /avatarproxy/:jellyfinUserId route, allowing a malicious or compromised Jellyfin or Emby server, or a man-in-the-middle attacker on a plaintext media-server connection, to supply traversal sequences that path.join and fs.writeFile normalize outside the cache directory, overwrite /app/dist/index.js or other files, and execute code as the node user after a container restart. This issue is fixed in version 3.4.0.

## Remediation

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