# CVE-2026-107449: Server-side request forgery in Heimdall

> Unauthenticated attackers can exploit SSRF in Heimdall to access internal network resources and metadata services via unprotected endpoints.

- **Severity:** Low 3.4 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 8 Oct 2026
- **Updated:** 8 Oct 2026
- **Also known as:** GHSA-hrj5-rw8j-34qj

## What is CVE-2026-107449?

CVE-2026-107449 is a low-severity server-side request forgery vulnerability in linuxserver Heimdall, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

linuxserver Heimdall through 2.8.3 applies its SafeUrlFetcher SSRF protection mechanism only to ItemController; the enhanced-application test and live-stats requests occur via SupportedApps::execute(), a GuzzleHttp client that lacks IP address restrictions. In some realistic installations, the POST /test_config (and GET /get_stats) endpoints are accessible through CSRF, and thus an unauthenticated attacker can force the server to send requests to arbitrary internal hosts and ports (including 169.254.169.254) and read a status/port oracle in addition to partial response data.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-107449?


## How do I fix CVE-2026-107449?

No fix has been published for CVE-2026-107449 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-107449 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107449 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107449 and fix it if it is affected.

What it is: CVE-2026-107449 is a low-severity server-side request forgery vulnerability in linuxserver Heimdall, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107449 exists.

Affected product: linuxserver Heimdall. 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-2026-107449/ (Markdown: https://insights.sbomify.com/CVE-2026-107449/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107449
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107449
- OSV: https://osv.dev/vulnerability/CVE-2026-107449

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107449/
Summaries are generated and may contain mistakes; the official description above is the record.