Is CVE-2026-109966 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-109966?

CVE-2026-109966 has a CVSS v3 severity of MEDIUM (5.3).

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CVE-2026-109966

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.