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TI-2026-71733 Aliases CVE-2026-109966GHSA-g8v9-4g6m-3vc9

Argument injection in yt-dlp-web-ui via JSON-RPC Service.Formats

Priority HIGH 70CWE-88Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-88.

Summary

yt-dlp-web-ui through 4.0.0 contains an argument injection flaw, CWE-88, in which a dash-prefixed url parameter is passed to yt-dlp as an option. An unauthenticated remote attacker can make yt-dlp load attacker-chosen JSON files from the server filesystem through the Service.Formats JSON-RPC method, and the file contents are reflected in responses. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00411 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
marcopiovanelloyt-dlp-web-uiup to 4.0.0—No fix listedCNA
  • yt-dlp-web-ui Vendormarcopiovanello Affected up to 4.0.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for yt-dlp-web-ui.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-109966
  2. 2026-10-13 Alias added: GHSA-g8v9-4g6m-3vc9
  3. 2026-10-14 Priority changed: MEDIUM → LOW
  4. 2026-10-26 CISA SSVC decision points changed
  5. 2026-10-26 Priority changed: LOW → HIGH

References

Exploit 1

Other 2

  • TI-2026-71734 NULL pointer dereference in yt-dlp-web-ui lets attackers crash the server CVSS 4.0HIGH 8.7
  • TI-2026-62949 marcopiovanello yt-dlp-web-ui generic.go NewGenericDownload command injection CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences