Vulnerability in Marcopiovanello Yt-Dlp-Web-Ui
CVE-2026-109966
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/marcopiovanello/yt-dlp-web-ui (product)
- github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/formats/parser.go (technical-description)
- github.com/vazzzy071-crypto/security-advisories/blob/main/advisories/2026-10-ma… (exploit, third-party-advisory)
- www.vulncheck.com/advisories/yt-dlp-web-ui-through-4.0.0-argument-injection-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109966?
- CVE-2026-109966 is a medium-severity vulnerability in Marcopiovanello Yt-Dlp-Web-Ui, classified under Argument Injection. CVSS score: 5.3/10. Published 2026-10-13.
- How severe is CVE-2026-109966?
- Medium severity. CVSS v3 base score is 5.3 out of 10.