CVE-2026-71212 (GCVE-0-2026-71212)

Vulnerability from cvelistv5 – Published: 2026-08-05 06:59 – Updated: 2026-08-05 06:59
VLAI
Title
xidown: Argument Injection via Unterminated yt-dlp Command Line Construction
Summary
xidown (a yt-dlp/ffmpeg GUI wrapper) builds its yt-dlp command-line invocation (xidown/core/scanner.py and downloader.py) by appending the user-provided or scanned URL as a bare trailing positional argument, with no '--' end-of-options marker and no scheme validation anywhere in the codebase. Because yt-dlp parses any argument beginning with '-' as a CLI option rather than link text, a crafted 'URL' value such as -U (yt-dlp's self-update flag) or --exec=... is parsed as a real yt-dlp option instead of a URL, altering the tool's control flow before its own URL validation runs. Full code execution via --exec was not demonstrated in the single-URL flow tested, but the underlying argument-injection primitive is confirmed and unmitigated across all call sites.
Severity
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version
indravoyager xidown Affected: 0 , ≤ 1.25.1.19 (custom)
Create a notification for this product.
Credits
Muhammadsiddiq
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "xidown",
          "programFiles": [
            "xidown/core/scanner.py",
            "xidown/core/downloader.py"
          ],
          "vendor": "indravoyager",
          "versions": [
            {
              "lessThanOrEqual": "1.25.1.19",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Muhammadsiddiq"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "xidown (a yt-dlp/ffmpeg GUI wrapper) builds its yt-dlp command-line invocation (xidown/core/scanner.py and downloader.py) by appending the user-provided or scanned URL as a bare trailing positional argument, with no \u0027--\u0027 end-of-options marker and no scheme validation anywhere in the codebase. Because yt-dlp parses any argument beginning with \u0027-\u0027 as a CLI option rather than link text, a crafted \u0027URL\u0027 value such as -U (yt-dlp\u0027s self-update flag) or --exec=... is parsed as a real yt-dlp option instead of a URL, altering the tool\u0027s control flow before its own URL validation runs. Full code execution via --exec was not demonstrated in the single-URL flow tested, but the underlying argument-injection primitive is confirmed and unmitigated across all call sites."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "value": "MEDIUM"
            },
            "type": "CVSS_3.1_severity"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-88",
              "description": "CWE-88 Argument Injection",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T06:59:26.576Z",
        "orgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "shortName": "TuranSec"
      },
      "references": [
        {
          "url": "https://cwe.mitre.org/data/definitions/88.html"
        }
      ],
      "title": "xidown: Argument Injection via Unterminated yt-dlp Command Line Construction"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
    "assignerShortName": "TuranSec",
    "cveId": "CVE-2026-71212",
    "datePublished": "2026-08-05T06:59:26.576Z",
    "dateReserved": "2026-08-05T06:56:15.799Z",
    "dateUpdated": "2026-08-05T06:59:26.576Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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