CVE-2026-66730highCWE-835

CVE-2026-66730: high-severity vulnerability in boazsegev facil.io

facil.io 0.6.0 - 0.7.6 Infinite Loop DoS via Multipart MIME Body Parser

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41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 8.7epss 0.8%
from disclosure to weaponsame day
Published on NVDJul 27
1st PoCJul 24
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
boazsegev · facil.io
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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