CVE-2026-66730

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facil.io 0.6.0 through 0.7.6 contains a denial-of-service vulnerability in the multipart body parser that allows an unauthenticated remote attacker to permanently freeze worker processes at 100% CPU by sending a multipart/form-data request with a partial closing boundary. The missing progress guard in the parser loop causes http_mime_parse to return 0 bytes consumed without setting done or error flags, causing the calling loop to re-invoke the parser on the same buffer indefinitely, exhausting all workers and permanently disabling the server until manually restarted.

• github.comhttps://github.com/theopaid/Infinite-Loop-DoS-in-facil.io-MIME-Parser
• www.vulncheck.comhttps://www.vulncheck.com/advisories/facil-io-infinite-loop-dos-via-multipart-mime-body-parser