What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-04 · updated 2026-07-22
• Weakness: CWE-918

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.

Affected products

• Tautulli: before 2.17.1

References

• 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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