# CVE-2026-7158: dmitryglhf mcp-url-downloader server.py _validate_url_safe server-side request forgery

> Remote attackers can exploit a validation flaw in the mcp-url-downloader library to perform server-side request forgery, potentially accessing internal resources.

- **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:** 27 Apr 2026
- **Updated:** 28 Apr 2026
- **Also known as:** GHSA-h7xc-4mv8-59fj, PYSEC-2026-2631

## What is CVE-2026-7158?

CVE-2026-7158 is a medium-severity server-side request forgery vulnerability in dmitryglhf mcp-url-downloader, published on 27 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in dmitryglhf mcp-url-downloader up to 4b8cf2de55f6e8864a77d108e8a94a5b8e4394c6. Affected by this issue is the function _validate_url_safe of the file src/mcp_url_downloader/server.py. Such manipulation of the argument url leads to server-side request forgery. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. The project was informed of the problem early through an issue report but has not responded yet.

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

## Which versions are affected by CVE-2026-7158?

3 open source packages ship an affected version, including mcp-url-downloader.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mcp-url-downloader` | PyPI | All versions to 0.1.0 | None |
| `mcp-url-downloader` | PyPI | All versions to 0.1.0 | None |
| `mcp-url-downloader` | PyPI | All versions to 0.1.0 | None |

## How do I fix CVE-2026-7158?

No fix has been published for CVE-2026-7158 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7158 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7158 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7158 and fix it if it is affected.

What it is: CVE-2026-7158 is a medium-severity server-side request forgery vulnerability in dmitryglhf mcp-url-downloader, published on 27 Apr 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-2026-7158 exists.

Affected packages and fixed versions:
- mcp-url-downloader (PyPI): affected all versions up to 0.1.0; no fix listed
- mcp-url-downloader (PyPI): affected all versions up to 0.1.0; no fix listed
- mcp-url-downloader (PyPI): affected all versions up to 0.1.0; no fix listed

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-2026-7158/ (Markdown: https://insights.sbomify.com/CVE-2026-7158/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7158
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7158
- OSV: https://osv.dev/vulnerability/CVE-2026-7158

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7158/
Summaries are generated and may contain mistakes; the official description above is the record.