Vulnerability · Published Oct 13, 2026 · Assigned by VulnCheck
CVE-2026-109966yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Method
Medium 5.3
In plain English
A medium-severity argument injection in yt-dlp-web-ui from marcopiovanello. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| marcopiovanello | yt-dlp-web-ui | 0 – through 4.0.0 |
Weakness: CWE-88 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- https://github.com/vazzzy071-crypto/security-advisories/blob/main/advisories/2026-10-marcopiovanello-yt-dlp-web-ui-rpc-arg-injection.md third-party-advisory, exploit
- https://github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/formats/parser.go technical-description
- https://github.com/marcopiovanello/yt-dlp-web-ui product
- VulnCheck Advisory: yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Method third-party-advisory