CVE-2026-73291Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag
Updated under an hour ago ()
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H
- Weakness (CWE)
- CWE-22, CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
seerr-team seerr seerr_team:seerr (from the name) | before 3.4.0 | CNA record |
References
- https://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8x-refsource-confirm
- https://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2x-refsource-misc
- https://github.com/seerr-team/seerr/releases/tag/v3.4.0x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.