seerr-team Seerr up to 3.3.x ImageProxy server/lib/imageproxy.ts path.join path traversal

Summaryinfo

A vulnerability was found in seerr-team Seerr up to 3.3.x and classified as critical. This affects the function path.join of the file server/lib/imageproxy.ts of the component ImageProxy. Executing a manipulation can lead to path traversal. This vulnerability is registered as CVE-2026-73291. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in seerr-team Seerr up to 3.3.x. It has been declared as critical. This vulnerability affects the function path.join of the file server/lib/imageproxy.ts of the component ImageProxy. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-73291 since 08/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 3.4.0 eliminates this vulnerability.

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Productinfo

Vendor

• seerr-team

Name

• Seerr

Version

• 3.0
• 3.1
• 3.2
• 3.3

Website

• Product: https://github.com/seerr-team/seerr/

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