CVE-2026-73291

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 v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.6 / Impact : 5.5

Attack Vector ADJACENT_NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-12 15:18

Updated : 2026-08-13 17:17

NVD link : CVE-2026-73291

Mitre link : CVE-2026-73291

CVE.ORG link : CVE-2026-73291

JSON object : View

Products Affected

No product.

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-94

Improper Control of Generation of Code ('Code Injection')

{"id": "CVE-2026-73291", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-73291", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-13T16:22:56.578886Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 5.5, "exploitabilityScore": 1.6}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "seerr-team", "product": "seerr", "versions": [{"status": "affected", "version": "< 3.4.0"}]}]}], "published": "2026-08-12T15:18:33.020", "references": [{"url": "https://github.com/seerr-team/seerr/commit/f484791105bd81bd5404e01410431ee6fe5769c2", "source": "security-advisories@github.com"}, {"url": "https://github.com/seerr-team/seerr/releases/tag/v3.4.0", "source": "security-advisories@github.com"}, {"url": "https://github.com/seerr-team/seerr/security/advisories/GHSA-mc6w-69r3-62h8", "source": "security-advisories@github.com"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-94"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-08-13T17:17:36.260", "sourceIdentifier": "security-advisories@github.com"}