CVE-2026-66730

EIP tracks 1 public exploit for CVE-2026-66730. PoCs published by theopaid.

AI-analyzed exploit summary Technical analysis of CVE-2026-66730, an infinite loop DoS vulnerability in facil.io's MIME parser. The flaw occurs when a multipart/form-data request ends with a partial closing boundary, causing the parser to stall and the calling loop to spin indefinitely at 100% CPU. The writeup includes root cause analysis, patch diffs, and a functional PoC script.

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.