CVE-2026-66729
High · 7.5CVSS
7.5
EPSS
0.8%
Published
Jul 27, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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