CVE-2026-73291
Received Received - Intake

Stored Path Traversal in Seerr Media Manager

Publication date: 2026-08-12

Last updated on: 2026-08-12

Assigner: GitHub, Inc.

Description
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.

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Meta Information

Published
2026-08-12
Last Modified
2026-08-12
Generated
2026-08-12
AI Q&A
2026-08-12
EPSS Evaluated
N/A
NVD
CVE-2026-73291
EUVD
EUVD-2026-57237

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
seerr seerr 3.4.0
jellyfin jellyfin *
emby emby *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
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.
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

Attack-Flow Graph

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Executive Summary

CVE-2026-73291 is a path traversal vulnerability in Seerr, an open-source media request manager. It affects versions before 3.4.0 and allows attackers to overwrite files on the server by manipulating HTTP response headers like ETag and Content-Type. This can lead to remote code execution when the server restarts.

Detection Guidance

Check Seerr version with 'docker exec <container_name> cat /app/package.json | grep version' or inspect logs for requests to /avatarproxy/:jellyfinUserId. Monitor for unexpected file modifications in /app/dist/ or cache directories.

Impact Analysis

An attacker could overwrite critical files like /app/dist/index.js, execute malicious code as the node user, or modify the SQLite database and settings.json. This requires control over the media server's response or a man-in-the-middle attack on an unencrypted connection.

Compliance Impact

This vulnerability could lead to unauthorized code execution, data breaches, or system compromise, violating GDPR's integrity and confidentiality requirements and HIPAA's security rules for protected health information. Compliance may be impacted due to potential loss of data integrity and availability.

Mitigation Strategies

Upgrade Seerr to version 3.4.0 or later immediately. Ensure media server connections use HTTPS to prevent MITM attacks. Restart containers after upgrade to apply fixes.

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