Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N L N N N N N H 8.7 .0060 45.9 —
AFFECTED Product Versions Fixed facil.io 0.6.0 – —
TIMELINE Jul 27 Reserved by VulnCheck Jul 27 Published (CNA: VulnCheck) Jul 30 EXPLOIT PUBLISHED — CVE-2026-66729 (boazsegev facil.io). Public exploit reference added.
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.
| Date | Event | Detail |
|---|---|---|
| July 27, 2026 | Reserved | Reserved by VulnCheck |
| July 27, 2026 | Published | Published (CNA: VulnCheck) |
| July 30, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-66729 (boazsegev facil.io). Public exploit reference added. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| boazsegev | facil.io | — | 0.6.0 | — |
Authoritative record: CVE-2026-66729 at cve.org
Vendors: boazsegev
Weaknesses: CWE-125
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66729 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.