CVE-2026-43986 Tautulli vulnerable to unauthenticated SSRF in /image/<hash> via attacker-seeded image hash replay
An unauthenticated attacker can trigger server-side requests to arbitrary URLs via a cached image hash, potentially accessing internal resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-43986?
CVE-2026-43986 is a critical server-side request forgery vulnerability in Tautulli, published on 4 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose a public `/image/<hash>` 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/<hash>.png` and cause the PMS or Tautulli host to fetch an arbitrary attacker-chosen URL. Version 2.17.1 patches the issue.
Weakness: CWE-918
Which versions are affected by CVE-2026-43986?
How do I fix CVE-2026-43986?
No fix has been published for CVE-2026-43986 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-43986 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43986 exists.
Sources
Also known as GHSA-m6j6-rc2c-8vpm.