CVE-2026-109966
yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Method
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 13, 2026
- Updated
- Oct 26, 2026
- Reserved
- Oct 13, 2026
Description
yt-dlp-web-ui through 4.0.0 contains an argument injection vulnerability that allows unauthenticated remote attackers to inject yt-dlp options by supplying a dash-prefixed url parameter to the Service.Formats JSON-RPC method. Attackers can send values like --load-info-json via /rpc/http or /rpc/ws to make yt-dlp load attacker-chosen JSON files from the server filesystem, with contents reflected in responses.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | VulnCheck |
Weaknesses
- CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Affected Products
| Product | Versions |
|---|---|
yt-dlp-web-uimarcopiovanello |
|
References
- https://github.com/vazzzy071-crypto/security-advisories/blob/main/advisories/2026-10-marcopiovanello-yt-dlp-web-ui-rpc-arg-injection.mdthird-party-advisoryexploit
- https://github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/formats/parser.gotechnical-description
- https://github.com/marcopiovanello/yt-dlp-web-uiproduct
- VulnCheck Advisory: yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Methodthird-party-advisory
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