FedML-AI FedML MQTT+S3 Communication Backend remote_storage.py S3Storage.read_model deserialization (CVE-2026-90614) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90614

FedML-AI FedML MQTT+S3 Communication Backend remote_storage.py S3Storage.read_model deserialization

Answer in brief

CVE-2026-90614 records a Unknown severity vulnerability in FedML-AI FedML MQTT+S3 Communication Backend remote_storage.py S3Storage.read_model deserialization. The current sources do not mark it as known exploited. The current feed maps FedML-AI/FedML (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 14, 2026Updated Sep 14, 2026Source checked Sep 14, 2026First seen by HOL Sep 14, 2026Material review Sep 14, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FedML-AI/FedML (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
FedML-AI/FedMLgeneric	0.9.0 \|\| 0.9.1 \|\| 0.9.2 \|\| 0.9.3 \|\| 0.9.4 \|\| 0.9.5 \|\| 0.9.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for FedML-AI/FedML.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 14, 2026

Sources and claim methodology

Upstream source description

A weakness has been identified in FedML-AI FedML up to 0.9.6. Affected by this issue is the function S3Storage.read_model of the file fedml/core/distributed/communication/s3/remote_storage.py of the component MQTT+S3 Communication Backend. This manipulation of the argument s3_key_str causes deserialization. Remote exploitation of the attack is possible. The project was informed of the problem early through an issue report but has not responded yet.

Quoted source text, attributed separately from HOL analysis.