What’s Vulnerable › Vulnerabilities

CVE-2026-73291: Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-12 · updated 2026-10-24
• Weakness: CWE-22

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.

Affected products

• seerr-team seerr: before 3.4.0

References

• https://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2
• https://github.com/seerr-team/seerr/releases/tag/v3.4.0
• https://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8

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