CVE-2026-109967

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.

CVSS 4.0

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-25)

CWE

CWE-476

Published

2026-10-13

Modified

2026-10-16

Record from

the NVD, synced 2026-10-19

References

• https://github.com/marcopiovanello/yt-dlp-web-ui
• https://github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/formats/parser.go
• https://github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/rpc/service.go
• https://github.com/vazzzy071-crypto/security-advisories/blob/main/advisories/2026-10-marcopiovanello-yt-dlp-web-ui-rpc-arg-injection.md
• https://www.vulncheck.com/advisories/yt-dlp-web-ui-through-4.0.0-null-pointer-dereference-dos-via-service-formats

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