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

Quick assessment

Affected
seerr-team seerr
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Seerr Team Seerr是Seerr Team组织开源的一个媒体资源请求管理工具。 Seerr Team Seerr 3.4.0之前版本存在安全漏洞，该漏洞源于ImageProxy使用上游ETag和Content-Type响应头构建缓存文件名，导致未经身份验证的攻击者通过路径遍历覆盖文件并在容器重启后以node用户执行任意代码。

CVSS 7.1 · High EPSS 0.39% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
seerr-team seerr < 3.4.0 affected
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I. Basic Information for CVE-2026-73291

Vulnerability Information
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Vulnerability Title
Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Seerr Team Seerr 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Seerr Team Seerr是Seerr Team组织开源的一个媒体资源请求管理工具。 Seerr Team Seerr 3.4.0之前版本存在安全漏洞，该漏洞源于ImageProxy使用上游ETag和Content-Type响应头构建缓存文件名，导致未经身份验证的攻击者通过路径遍历覆盖文件并在容器重启后以node用户执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
seerr-team seerr < 3.4.0 -

II. Public POCs for CVE-2026-73291

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Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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III. Intelligence Information for CVE-2026-73291

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Vendor Advisories for CVE-2026-73291 (1)

Other References for CVE-2026-73291 (1)

IV. Related Vulnerabilities

Same product: seerr
Same vendor: seerr-team
Same weakness: CWE-22

V. Comments for CVE-2026-73291

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