---
id: CVE-2026-109967
title: >-
  yt-dlp-web-ui through 4.0.0 contains a NULL pointer dereference vulnerability
  in the Service.Formats JSON-RPC method that allows remote unauthenticated
  attackers to crash the server
summary: >-
  yt-dlp-web-ui through 4.0.0 contains a NULL pointer dereference vulnerability
  in the Service.Formats JSON-RPC method that allows remote unauthenticated
  attackers to crash the server. Attackers can send a single request with a url
  value l…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T14:17:36.390'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109967'
references:
  - url: 'https://github.com/marcopiovanello/yt-dlp-web-ui'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/formats/parser.go
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/rpc/service.go
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/vazzzy071-crypto/security-advisories/blob/main/advisories/2026-10-marcopiovanello-yt-dlp-web-ui-rpc-arg-injection.md
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/yt-dlp-web-ui-through-4.0.0-null-pointer-dereference-dos-via-service-formats
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-13T14:29:01.858Z'
---

## Overview

yt-dlp-web-ui through 4.0.0 contains a NULL pointer dereference vulnerability in the Service.Formats JSON-RPC method that allows remote unauthenticated attackers to crash the server. Attackers can send a single request with a url value like --version, causing invalid yt-dlp JSON output and an unrecovered panic that terminates the process.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.