CVE-2026-66730 — facil.io 0.6.0 - 0.7.6 Infinite Loop DoS via Multipart MIME Body Parser
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 …
Published: 2026-07-27 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7