CVE-2026-109966
5.3MediumPublished 13 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Impact
- Limited impact
- Weakness
- CWE-88
Impact
Unauthenticated remote attackers can read arbitrary local JSON files from the server filesystem. They only need network access to the /rpc/http or /rpc/ws endpoints.
Root cause
The Service.Formats JSON-RPC handler fails to sanitize or separate dash-prefixed input passed to the url parameter, letting user input execute as command-line arguments to yt-dlp.
Affected systems
yt-dlp-web-ui through 4.0.0
CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Fix & remediation
No fixed version is listed; block or restrict access to the /rpc/http and /rpc/ws endpoints, or take the yt-dlp-web-ui service offline until a patch is released.
AI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD 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.
References
- https://github.com/marcopiovanello/yt-dlp-web-ui
- https://github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/formats/parser.go
- https://github.com/vazzzy071-crypto/security-advisories/blob/main/advisories/2026-10-marcopiovanello-yt-dlp-web-ui-rpc-arg-injection.md
- https://www.vulncheck.com/advisories/yt-dlp-web-ui-through-4.0.0-argument-injection-via-service-formats-json-rpc-method