CVE-2026-109967 yt-dlp-web-ui through 4.0.0 NULL Pointer Dereference DoS via Service.Formats
Remote unauthenticated attackers can crash the yt-dlp-web-ui server by sending a crafted request to the Service.Formats method.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109967?
CVE-2026-109967 is a high-severity vulnerability in marcopiovanello yt-dlp-web-ui, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-476
Which versions are affected by CVE-2026-109967?
How do I fix CVE-2026-109967?
No fix has been published for CVE-2026-109967 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109967 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109967 exists.
Sources
Also known as GHSA-vw64-j3q3-fxf9.