NIXPKGS-2026-2424

GitHub issue published 3 hours ago

Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag

Permalink CVE-2026-73291

7.1 HIGH

CVSS version (CVSS): 3.1
Attack Vector (AV): Adjacent (A)
Attack Complexity (AC): High (H)
Privileges Required (PR): None (N)
User Interaction (UI): None (N)
Scope (S): Unchanged (U)
Confidentiality (C): Low (L)
Integrity (I): High (H)
Availability (A): High (H)
Modified Attack Vector (MAV): Adjacent (A)
Modified Attack Complexity (MAC): High (H)
Modified Privileges Required (MPR): None (N)
Modified User Interaction (MUI): None (N)
Modified Confidentiality (MC): Low (L)
Modified Scope (MS): Unchanged (U)
Modified Integrity (MI): High (H)
Modified Availability (MA): High (H)

updated 3 hours ago by @LeSuisse Activity log

Created suggestion 8 hours ago
@LeSuisse ignored
4 packages
- overseerr
- jellyseerr
- python313Packages.python-overseerr
- python314Packages.python-overseerr
4 hours ago
@LeSuisse accepted 4 hours ago
@LeSuisse published on GitHub 3 hours ago

Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag

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.