# 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.

- **Severity:** Critical 9.9 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Jun 2026
- **Updated:** 4 Jun 2026
- **Also known as:** GHSA-m6j6-rc2c-8vpm

## 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 (Server-Side Request Forgery)

## 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.

## Is CVE-2026-43986 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43986 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-43986 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43986 exists.

Affected product: Tautulli. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-43986/ (Markdown: https://insights.sbomify.com/CVE-2026-43986/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-43986
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-43986
- OSV: https://osv.dev/vulnerability/CVE-2026-43986

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-43986/
Summaries are generated and may contain mistakes; the official description above is the record.