CVE-2026-109966
yt-dlp-web-ui through 4.0.0 Argument Injection via Service.Formats JSON-RPC Method
marcopiovanello yt-dlp-web-ui
CVSS
6.9MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.41%Chance of exploitation activity in the next 30 days, higher than 34% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
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.
Text from CVE List
Affected versions 1
- yt-dlp-web-uiaffected: all versions through 4.0.0CVE List
References 4
- vulncheck.com/advisories/yt-dlp-web-ui-through-4.0.0-argument-injection-via-service-formats-json-rpc-methodAdvisoryvia CVE List
- github.com/vazzzy071-crypto/security-advisories/blob/main/advisories/2026-10-marcopiovanello-yt-dlp-web-ui-rpc-arg-injection.mdExploitvia CVE List
- github.com/marcopiovanello/yt-dlp-web-ui/blob/v4.0.0/server/formats/parser.goReferencevia CVE List
- github.com/marcopiovanello/yt-dlp-web-uiReferencevia CVE List