CVE-2026-66729
facil.io 0.6.0 - 0.7.6 Integer Underflow DoS via Multipart MIME Body Parser
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
facil.io 0.6.0 through 0.7.6 contains an integer underflow vulnerability in the multipart MIME body parser that allows unauthenticated remote attackers to crash the server process by sending a crafted Content-Disposition header with an empty field name. Attackers can trigger a uint32_t wraparound in http_mime_parser.h causing an out-of-bounds memory read past the name pointer, resulting in a bus fault that crashes the handling worker with a single POST request.
| CWE | CWE-125 |
| Vendor | boazsegev |
| Product | facil.io |
| Published | Jul 27, 2026 |
| Last Updated | Jul 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
boazsegev / facil.io
0.6.0 ≤ 0.7.6
References
Credits
Theodosis Paidakis