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CVE-2026-66730— facil.io 0.6.0 - 0.7.6 Infinite Loop DoS via Multipart MIME Body Parser

Quick assessment

Affected
boazsegev facil.io
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

facil.io 0.6.0 至 0.7.6 版本在 multipart body parser（多部分主体解析器）中存在一个拒绝服务（DoS）漏洞。未经验证的远程攻击者可以通过发送带有部分结束边界的 multipart/form-data 请求，永久使工作进程占用 100% CPU，导致服务器拒绝服务。 解析器循环中缺失进度检查（progress guard），导致 http_mime_parse 函数返回 0 字节已消耗，但未设置 done 或 error 标志。这使得调用方循环无限次地在同一缓冲区重新调用解析

CVSS 7.5 · High EPSS 0.78% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
boazsegev facil.io 0.6.0≤ 0.7.6 affected
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I. Basic Information for CVE-2026-66730

Vulnerability Information
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Vulnerability Title
facil.io 0.6.0 - 0.7.6 Infinite Loop DoS via Multipart MIME Body Parser
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
boazsegev facil.io 0.6.0 ~ 0.7.6 -

II. Public POCs for CVE-2026-66730

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9269 chars
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III. Intelligence Information for CVE-2026-66730

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Vendor Advisories for CVE-2026-66730 (1)

Proof of Concept for CVE-2026-66730 (1)

Security Blog Posts for CVE-2026-66730 (1)

Same Patch Batch · boazsegev · 2026-07-27 · 3 CVEs total

CVE-2026-66729 7.5 HIGH facil.io 0.6.0 - 0.7.6 Integer Underflow DoS via Multipart MIME Body Parser
CVE-2026-66731 7.5 HIGH facil.io 0.7.5 - 0.7.6 HTTP/1.1 Chunked Transfer Encoding Parser Crash DoS

IV. Related Vulnerabilities

Same product: facil.io
Same vendor: boazsegev
Same weakness: CWE-835

V. Comments for CVE-2026-66730

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