What is CVE-2026-66730?

CVE-2026-66730 is a high-severity vulnerability in Boazsegev Facil.io, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-07-27.

How severe is CVE-2026-66730?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2026-66730 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Boazsegev Facil.io

CVE-2026-66730

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…

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Boazsegev Facil.io — versions 0.6.0

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

Public proof-of-concept exploits

theopaid/CVE-2026-66730-Infinite-Loop-DoS-in-facil.io-MIME-Parser

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-66730?: CVE-2026-66730 is a high-severity vulnerability in Boazsegev Facil.io, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-07-27.
How severe is CVE-2026-66730?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2026-66730 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.