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CVE-2026-73291

Seerr: Path traversal to RCE via /avatarproxy image cache filename from upstream ETag

Published: Aug 12, 2026Updated: Aug 13, 2026 Sources: CVE List NVDCWE-22
7.1HIGH
NVD MITRE
EPSS Score
0.3%
Top 80.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:AAC:HPR:NUI:NS:UC:LI:HA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-22CWE-94

Affected Products

seerr-team
oss-project
seerrOn-prem
OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

4 techniques
Collection
Discovery
Execution
Initial Access
View detailed technique mapping

References

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

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