Path Traversal Vulnerability in Facil.io by Boaz Segev
CVE-2026-16653

6.9MEDIUM

Key Information:

Vendor

Boazsegev

Status
Facil.io
Vendor
CVE Published:
23 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16653?

A significant security flaw has been identified in the facil.io framework, specifically within the http_sendfile2 function located in the file lib/facil/http/http.c, which serves as a Public Folder Handler. This vulnerability allows for path traversal attacks, enabling unauthorized access to restricted directories and potentially sensitive files within the system. Attackers can exploit this flaw remotely, as the exploit has already been made public. Although the development team was made aware of this issue through an early report, no fix has been issued as of yet, posing ongoing risks to users of facil.io versions up to 0.7.58.

Affected Version(s)

facil.io 0.7.0

facil.io 0.7.1

facil.io 0.7.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-16653 - Proof of Concept

References

https://vuldb.com/vuln/382396
vdb-entrytechnical-description
https://vuldb.com/vuln/382396/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-16653
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Fantasy_2026 (VulDB User)
VulDB CNA Team
.