YoutubeDLSharp allows command injection on windows system due to non sanitized arguments
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-77.
Summary
YoutubeDLSharp is a wrapper for the command-line video downloaders youtube-dl and yt-dlp. In versions starting from 1.0.0-beta4 and prior to 1.1.2, an unsafe conversion of arguments allows the injection of a malicious commands when starting `yt-dlp` from a commands prompt running on Windows OS with the `UseWindowsEncodingWorkaround` value defined to true (default behavior). If a user is using built-in methods from the YoutubeDL.cs file, the value is true by default and a user cannot disable it from these methods. This issue has been patched in version 1.1.2.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Bluegrams | YoutubeDLSharp | 1.0.0-beta4 to before 1.1.2 | 1.1.2 | Patch available | CNA |
| — | YoutubeDLSharp (NuGet) | 1.0.0-beta4 to before 1.1.2 | 1.1.2 | Patch available | GHSA-2jh5-g5ch-43q5 |
- YoutubeDLSharp VendorBluegrams Affected 1.0.0-beta4 to before 1.1.2 Fixed in 1.1.2 Patch available CNA
- YoutubeDLSharp (NuGet) Vendor— Affected 1.0.0-beta4 to before 1.1.2 Fixed in 1.1.2 Patch available GHSA-2jh5-g5ch-43q5
Remediation
- Fix · CNA YoutubeDLSharp (Bluegrams) Fixed in 1.1.2
- Fix · GHSA-2jh5-g5ch-43q5 YoutubeDLSharp (NuGet) Fixed in 1.1.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-43858
- 2026-10-03 Alias added: GHSA-2jh5-g5ch-43q5
References
Other 4
- https://github.com/Bluegrams/YoutubeDLSharp/security/advisories/GHSA-2jh5-g5ch-43q5
- https://github.com/Bluegrams/YoutubeDLSharp/commit/b6051372bd5af30f95f73de47d9bc71c3a07de0f
- https://github.com/Bluegrams/YoutubeDLSharp/commit/fdf3256da18d0e2da4a2f33ad4a1b72ff8273a50
- https://github.com/Bluegrams/YoutubeDLSharp
Sources
- CVE-2025-43858 · CVE Program
- CVE-2025-43858 · NVD
- FIRST EPSS
- GHSA-2jh5-g5ch-43q5 · GitHub Advisory Database · CC BY 4.0
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