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Vulnerability record · CVE-2026-43986 · published 4 June 2026

CVE-2026-43986: Server-side request forgery (SSRF) vulnerability

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.

9.9 CVSS 3.1 Critical EPSS 0.43% · top 65.1% CWE-918 · Server-side request forgery (SSRF) Deferred
9.9CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
22 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

References

LinkTags
https://github.com/Tautulli/Tautulli/releases/tag/v2.17.1
https://github.com/Tautulli/Tautulli/security/advisories/GHSA-m6j6-rc2c-8vpm
https://github.com/Tautulli/Tautulli/security/advisories/GHSA-m6j6-rc2c-8vpm

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Source: NIST National Vulnerability Database (record CVE-2026-43986), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.