CVE-2026-66729
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductBoazsegev Facil.io
PublishedJul 27, 2026
First seenJul 27, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| boazsegev facil.io | 0.6.0 ≤ v ≤ 0.7.6 | — |
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