CVE-2026-43986 – Tautulli vulnerable to unauthenticated SSRF in /image/ via attacker-seeded image hash replay

CVE ID :CVE-2026-43986

Published : June 4, 2026, 4:16 p.m. | 16 minutes ago

Description :Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose a public `/image/` route that resolves attacker-controlled entries from `image_hash_lookup` and replays them through the same server-side image fetch logic used by authenticated image proxying. A low-privilege guest user can seed a malicious external image URL into this lookup table and then trigger server-side fetches through a fully unauthenticated endpoint. This turns an authenticated SSRF primitive into a persistent unauthenticated SSRF gadget. Once the malicious hash entry exists, any external user can request `/image/.png` and cause the PMS or Tautulli host to fetch an arbitrary attacker-chosen URL. Version 2.17.1 patches the issue.

Severity: 9.9 | CRITICAL

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