Tautulli up to 2.17.0 Endpoint server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, has been found in Tautulli up to 2.17.0. Affected by this issue is some unknown functionality of the component Endpoint. The manipulation leads to server-side request forgery. This vulnerability is traded as CVE-2026-43986. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Tautulli up to 2.17.0. It has been rated as critical. This issue affects an unknown functionality of the component Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-43986 since 05/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available.

Upgrading to version 2.17.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-34286). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Tautulli

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17.0

Website

• Product: https://github.com/Tautulli/Tautulli/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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