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.
Advisories

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Fixes

Solution

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Workaround

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History

Thu, 13 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 12 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Seerr-team
Seerr-team seerr
Vendors & Products Seerr-team
Seerr-team seerr

Wed, 12 Aug 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag
Weaknesses CWE-22
CWE-94
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-13T16:23:07.044Z

Reserved: 2026-08-11T19:42:11.450Z

Link: CVE-2026-73291

cve-icon Vulnrichment

Updated: 2026-08-13T16:23:03.461Z

cve-icon NVD

Status : Received

Published: 2026-08-12T15:18:33.020

Modified: 2026-08-13T17:17:36.260

Link: CVE-2026-73291

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T00:15:04Z

Weaknesses