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CVE-2026-109966— yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Method

Quick assessment

Affected
marcopiovanello yt-dlp-web-ui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

yt-dlp-web-ui 4.0.0 及更早版本存在一个参数注入漏洞，允许未认证的远程攻击者通过在 Service.Formats JSON-RPC 方法中提供以短横线（-）开头的 URL 参数，注入 yt-dlp 选项。攻击者可以通过 /rpc/http 或 /rpc/ws 发送类似 --load-info-json 的值，使 yt-dlp 从服务器文件系统中加载攻击者选择的 JSON 文件，并将这些文件的内容反映在响应中。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
marcopiovanello yt-dlp-web-ui ≤ 4.0.0 affected
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I. Basic Information for CVE-2026-109966

Vulnerability Information
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Vulnerability Title
yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Method
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
参数注入或修改
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
marcopiovanello yt-dlp-web-ui 0 ~ 4.0.0 -

II. Public POCs for CVE-2026-109966

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III. Intelligence Information for CVE-2026-109966

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Vendor Advisories for CVE-2026-109966 (2)

Other References for CVE-2026-109966 (1)

IV. Related Vulnerabilities

Same product: yt-dlp-web-ui
Same vendor: marcopiovanello
Same weakness: CWE-88

V. Comments for CVE-2026-109966

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