Vulnerability Description
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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/theopaid/Infinite-Loop-DoS-in-facil.io-MIME-Parser
- https://tpaidakis.com/writeups/facilio-parser-dos/
- https://www.vulncheck.com/advisories/facil-io-infinite-loop-dos-via-multipart-mi
FAQ
What is CVE-2026-66730?
CVE-2026-66730 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 b...
How severe is CVE-2026-66730?
CVE-2026-66730 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66730?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.