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CVE-2026-73291

7.1 · HIGH

Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby.

Published Aug 12, 2026CWE-22EPSS 0.39%

Overview

CVE-2026-73291 is a high-severity vulnerability. It was published on August 12, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2GitHubgithub.com/seerr-team/seerr/releases/tag/v3.4.0GitHubgithub.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-73291?

CVE-2026-73291 is a high-severity vulnerability. It was published on August 12, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-73291?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-73291?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-73291?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-73291 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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