Path Traversal Vulnerability in FedML-AI's MQTT Message Handler
CVE-2026-5535

5.3MEDIUM

Key Information:

Vendor

Fedml-ai

Status
Fedml
Vendor
CVE Published:
5 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5535?

A security vulnerability has been identified in FedML-AI's FedML up to version 0.8.9, which affects a component of the software known as the MQTT Message Handler within the FileUtils.java file. This flaw allows for a path traversal attack via manipulated argument dataSet, enabling unauthorized access to system files. The potential exploit can be executed remotely, posing significant risks if leveraged by malicious actors. Despite an early disclosure attempt, the vendor has not responded, raising concerns about the timely patching of this security issue.

Affected Version(s)

FedML 0.8.0

FedML 0.8.1

FedML 0.8.2

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-2026-5535 - Proof of Concept

References

https://vuldb.com/vuln/355288
vdb-entrytechnical-description
https://vuldb.com/vuln/355288/cti
signaturepermissions-required
https://vuldb.com/submit/782200
third-party-advisory

CVSS V4

Score:
5.3
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

Ana10gy (VulDB User)
VulDB CNA Team
.