# YoutubeDLSharp allows command injection on windows system due to non sanitized arguments

Advisory record · `GHSA-2jh5-g5ch-43q5`

- **Identifiers:** `GHSA-2jh5-g5ch-43q5` · `CVE-2025-43858`
- **State:** Confirmed
- **Severity:** CVSS 9.2 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-77](https://cwe.mitre.org/data/definitions/77.html) · [CWE-78](https://cwe.mitre.org/data/definitions/78.html)
- **Tags:** [Command injection](https://agentprime.io/advisories/tag/command-injection.md)
- **Published:** 23 Apr 2025
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 23 Apr 2025, 22:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.2: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `YoutubeDLSharp` (NuGet): affected `>=1.0.0-beta4, <1.1.2`; fixed in `1.1.2`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> YoutubeDLSharp versions from 1.0.0-beta4 before 1.1.2 are affected on Windows. Untrusted input passed to yt-dlp is appended unsanitized to a command prompt string, letting an attacker inject and run arbitrary commands. Upgrade to 1.1.2 or higher; earlier versions can only be partly mitigated by sanitizing input.

Written 9 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.2 Critical, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0026, the 18th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:21 UTC: First seen by agentprime
- 31 Oct 2026, 15:21 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2jh5-g5ch-43q5)

## Sources

- [GitHub Advisory Database: GHSA-2jh5-g5ch-43q5](https://github.com/advisories/GHSA-2jh5-g5ch-43q5)
- [OSV: GHSA-2jh5-g5ch-43q5](https://osv.dev/vulnerability/GHSA-2jh5-g5ch-43q5)
- <https://github.com/Bluegrams/YoutubeDLSharp/security/advisories/GHSA-2jh5-g5ch-43q5>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-43858>
- <https://github.com/Bluegrams/YoutubeDLSharp/commit/b6051372bd5af30f95f73de47d9bc71c3a07de0f>
- <https://github.com/Bluegrams/YoutubeDLSharp/commit/fdf3256da18d0e2da4a2f33ad4a1b72ff8273a50>
- <https://github.com/Bluegrams/YoutubeDLSharp>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-2jh5-g5ch-43q5>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-2jh5-g5ch-43q5/>. Everything for agents: <https://agentprime.io/llms.txt>.