# CVE-2026-100901: athlon1600 youtube-downloader stream.php stream server-side request forgery

> Remote attackers can exploit a server-side request forgery vulnerability in the stream function to access internal resources or bypass security controls.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-r276-5vww-gpvg

## What is CVE-2026-100901?

CVE-2026-100901 is a medium-severity server-side request forgery vulnerability in athlon1600 youtube-downloader, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in athlon1600 youtube-downloader up to 4.0.1. Affected by this vulnerability is the function stream of the file public/stream.php. The manipulation of the argument url results in server-side request forgery. It is possible to launch the attack remotely. The exploit has been made public and could be used. Commit 6ffe823 'better security for public/stream.php' only added CURLOPT_PROTOCOLS http/https restriction and MAXREDIRS cap, does not restrict destination host. The vendor was contacted early about this disclosure but did not respond in any way.

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

## Which versions are affected by CVE-2026-100901?


## How do I fix CVE-2026-100901?

No fix has been published for CVE-2026-100901 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-100901 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100901 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100901 and fix it if it is affected.

What it is: CVE-2026-100901 is a medium-severity server-side request forgery vulnerability in athlon1600 youtube-downloader, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100901 exists.

Affected product: athlon1600 youtube-downloader. 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-2026-100901/ (Markdown: https://insights.sbomify.com/CVE-2026-100901/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100901
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100901
- OSV: https://osv.dev/vulnerability/CVE-2026-100901

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100901/
Summaries are generated and may contain mistakes; the official description above is the record.