CVE-2026-109966CWE-88

CVE-2026-109966

Medium · published October 13, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
34.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
6.9 · 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
EPSS
0.00411 · 34.3th percentile
Weakness
CWE-88 · Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Published
2026-10-13T18:17Z
References (4)
https://github.com/marcopiovanello/yt-dlp-web-ui · [email protected]https://github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/formats/parser.go · [email protected]https://github.com/vazzzy071-crypto/security-advisories/blob/main/advisories/2026-10-marcopiovanello-yt-dlp-web-ui-rpc-arg-injection.md · [email protected]https://www.vulncheck.com/advisories/yt-dlp-web-ui-through-4.0.0-argument-injection-via-service-formats-json-rpc-method · [email protected]
EPSS history
Timeline
  • 15 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 13 OCT 14:00Z
    yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Method
    cvelistv5
  • 13 OCT 14:00Z
    yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Method
    cvelistv5