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Vulnerabilities

CVE-2026-5536

High
CWE-20 — Weakness Type
Published: Apr 5, 2026  ·  Modified: Apr 12, 2026  ·  Source: NVD
CVSS v3
7.3
🔗 NVD Official
📄 Description (English)

A weakness has been identified in FedML-AI FedML up to 0.8.9. Affected is the function sendMessage of the file grpc_server.py of the component gRPC server. Executing a manipulation can lead to deserialization. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.

🤖 AI Executive Summary

CVE-2026-5536 is a high-severity deserialization vulnerability in FedML-AI's gRPC server (versions up to 0.8.9) that allows remote attackers to execute arbitrary code through malicious message manipulation. The vulnerability exists in the sendMessage function of grpc_server.py and has no available patch, requiring immediate compensating controls. This poses significant risk to organizations using FedML for distributed machine learning and federated learning applications.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 7, 2026 10:32
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi organizations in: (1) Financial Services & Banking - institutions using FedML for distributed ML models in fraud detection and risk analysis; (2) Government & Research - KACST and government research centers utilizing federated learning for data-sensitive applications; (3) Telecommunications - STC and other telecom operators using FedML for network optimization and customer analytics; (4) Healthcare - hospitals and health authorities implementing federated learning for medical research without centralizing patient data; (5) Energy Sector - ARAMCO and energy companies using distributed ML for predictive maintenance. The lack of vendor response and missing patch significantly elevates risk for all affected deployments.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Research and Academia Telecommunications Healthcare and Medical Research Energy and Utilities Insurance
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all FedML deployments across your organization and identify systems running versions up to 0.8.9
2. Isolate affected gRPC servers from untrusted networks immediately
3. Implement network segmentation to restrict access to gRPC endpoints (port 50051 by default)
4. Enable comprehensive logging and monitoring of all gRPC communications

Compensating Controls:
1. Deploy Web Application Firewall (WAF) rules to inspect and validate gRPC message payloads before reaching the server
2. Implement strict input validation and deserialization filters at the network boundary
3. Use mutual TLS (mTLS) authentication to restrict communication to authorized clients only
4. Deploy intrusion detection systems (IDS) with signatures for malicious gRPC payloads
5. Implement rate limiting and connection throttling on gRPC endpoints

Patching Guidance:
1. Monitor FedML GitHub repository for security updates beyond version 0.8.9
2. Prepare upgrade path to latest stable version once available
3. Test patches in isolated environment before production deployment
4. Consider alternative federated learning frameworks if FedML updates are delayed

Detection Rules:
1. Monitor for unusual deserialization patterns in gRPC server logs
2. Alert on unexpected process execution spawned from gRPC server processes
3. Track failed authentication attempts to gRPC endpoints
4. Monitor for abnormal memory usage or CPU spikes in gRPC server processes
5. Implement YARA rules to detect malicious serialized payloads in network traffic
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع نشرات FedML عبر مؤسستك وحدد الأنظمة التي تعمل بالإصدارات حتى 0.8.9
2. عزل خوادم gRPC المتأثرة عن الشبكات غير الموثوقة فوراً
3. تطبيق تقسيم الشبكة لتقييد الوصول إلى نقاط نهاية gRPC (المنفذ 50051 افتراضياً)
4. تفعيل السجلات الشاملة ومراقبة جميع اتصالات gRPC

الضوابط التعويضية:
1. نشر قواعد جدار الحماية (WAF) للتحقق من صحة حمولات رسائل gRPC قبل وصولها إلى الخادم
2. تطبيق التحقق الصارم من المدخلات وتصفية إلغاء التسلسل على حدود الشبكة
3. استخدام مصادقة TLS المتبادلة (mTLS) لتقييد الاتصال بالعملاء المصرح لهم فقط
4. نشر أنظمة كشف التسلل (IDS) مع توقيعات لحمولات gRPC الضارة
5. تطبيق تحديد معدل الطلب والتحكم في الاتصالات على نقاط نهاية gRPC

إرشادات التصحيح:
1. مراقبة مستودع FedML على GitHub للتحديثات الأمنية بعد الإصدار 0.8.9
2. تحضير مسار الترقية إلى أحدث إصدار مستقر عند توفره
3. اختبار التصحيحات في بيئة معزولة قبل نشرها في الإنتاج
4. النظر في أطر عمل التعلم الفيدرالي البديلة إذا تأخرت تحديثات FedML

قواعد الكشف:
1. مراقبة أنماط إلغاء التسلسل غير العادية في سجلات خادم gRPC
2. التنبيه على تنفيذ العمليات غير المتوقعة التي تنشأ من عمليات خادم gRPC
3. تتبع محاولات المصادقة الفاشلة على نقاط نهاية gRPC
4. مراقبة استخدام الذاكرة غير الطبيعي أو ارتفاع استخدام المعالج في عمليات خادم gRPC
5. تطبيق قواعد YARA للكشف عن الحمولات المسلسلة الضارة في حركة المرور على الشبكة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.14.2.1 - Secure development policy ECC 2024 A.12.3.1 - Configuration management ECC 2024 A.12.2.1 - Change management
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset Management and Identification SAMA CSF PR.IP-12 - Security awareness and training SAMA CSF DE.CM-1 - Detection and analysis SAMA CSF RS.MI-1 - Incident response and recovery
🟡 ISO 27001:2022
ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities ISO 27001:2022 A.14.2.1 - Secure development, testing and acceptance ISO 27001:2022 A.12.3.1 - Configuration management ISO 27001:2022 A.8.1.1 - Inventory of assets
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and updates PCI DSS 6.5.1 - Injection flaws PCI DSS 11.2 - Vulnerability scanning
📊 CVSS Score
7.3
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityL — Low / Local
IntegrityL — Low / Local
AvailabilityL — Low / Local
📋 Quick Facts
Severity High
CVSS Score7.3
CWECWE-20
EPSS0.04%
Exploit No
Patch ✗ No
Published 2026-04-05
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
8.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-20
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