Vulnerability · Published Apr 5, 2026 · Assigned by VulDB

CVE-2026-5535FedML-AI FedML MQTT Message FileUtils.java path traversal

Medium 4.3

In plain English

A medium-severity path traversal in FedML from FedML-AI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.5%top 54.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A security flaw has been discovered in FedML-AI FedML up to 0.8.9. This impacts an unknown function of the file FileUtils.java of the component MQTT Message Handler. Performing a manipulation of the argument dataSet results in path traversal. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products (as reported)

Vendor	Product	Versions
FedML-AI	FedML	0.8.00.8.10.8.20.8.30.8.40.8.50.8.60.8.7

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R

References

VDB-355288 | FedML-AI FedML MQTT Message FileUtils.java path traversal vdb-entry, technical-description
VDB-355288 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #782200 | FedML-AI FedML <=0.8.9 Path Traversal third-party-advisory
https://github.com/AnalogyC0de/public_exp/issues/25 exploit, issue-tracking