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CVE-2026-66730

HIGH Exploitation: PoC
7.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-66730
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-07-27 16:27 UTC
Published
2026-07-27 16:55 UTC
Last updated
2026-07-27 18:20 UTC
Primary CWE
CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
Vendor / Product
boazsegev / facil.io
Sources
cve.org  ·  NVD

Severity & Metrics

7.5 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
boazsegev facil.io — 0.6.0 ≤ 0.7.6
Weakness (CWE)
CWESourceDescription
CWE-835 cna Loop with Unreachable Exit Condition ('Infinite Loop')
CVSS scores (2)
ScoreSeverityVersionSourceVector
8.7 HIGH 4.0 cna 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
7.5 HIGH 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References (2)
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