NVIDIA FLARE SDK Vulnerability: Untrusted Deserialization Leads to RCE
The National Vulnerability Database (NVD) has disclosed CVE-2026-24186, a high-severity vulnerability (CVSS 8.8) impacting NVIDIA FLARE SDK. The flaw resides in the FOBS component, where an attacker can trigger deserialization of untrusted data by sending a specially crafted, malicious FOBS-encoded message.
This deserialization vulnerability, categorized as CWE-502, carries significant risk. A successful exploit could lead directly to remote code execution (RCE). The NVD indicates that while the specific affected products within the NVIDIA FLARE SDK were not detailed, organizations using any part of the SDK should assume exposure.
Attackers consistently leverage deserialization flaws for initial access and privilege escalation. This is a direct path to system compromise. Defenders need to prioritize patching and, critically, ensure robust input validation and message integrity checks on any systems processing FOBS-encoded data within NVIDIA FLARE SDK environments. Assume these messages are hostile until proven otherwise.
What This Means For You
- If your organization utilizes NVIDIA FLARE SDK, you must identify all instances processing FOBS-encoded messages. Prioritize patching for CVE-2026-24186 immediately. Review network segmentation and access controls around these systems, treating them as high-value targets for RCE.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-24186: NVIDIA FLARE SDK Untrusted Deserialization RCE Attempt
title: CVE-2026-24186: NVIDIA FLARE SDK Untrusted Deserialization RCE Attempt
id: scw-2026-04-28-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-24186 by identifying web requests containing 'FOBS-encoded message' within the query string, indicative of an untrusted deserialization attempt in the NVIDIA FLARE SDK.
author: SCW Feed Engine (AI-generated)
date: 2026-04-28
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-24186/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- 'FOBS-encoded message'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-24186 | Deserialization | NVIDIA FLARE SDK |
| CVE-2026-24186 | RCE | NVIDIA FLARE SDK FOBS component |
| CVE-2026-24186 | Deserialization | Untrusted data deserialization via malicious FOBS-encoded message |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 28, 2026 at 22:36 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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