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Vulnerabilities

CVE-2026-21226

High
Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.
CWE-502 — Weakness Type
Published: Jan 13, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.

🤖 AI Executive Summary

CVE-2026-21226 is a high-severity deserialization vulnerability in Microsoft Azure Core shared client library for Python that allows authenticated attackers to execute arbitrary code remotely. This vulnerability affects organizations using Azure SDK for Python across multiple services. Immediate patching is critical as the vulnerability impacts core Azure infrastructure components widely deployed in enterprise environments.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 3, 2026 17:08
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations heavily invested in Microsoft Azure cloud services, particularly: SAMA-regulated financial institutions using Azure for banking operations and data processing; Saudi government entities (NCA, CITC) relying on Azure for digital transformation initiatives; Saudi Aramco and energy sector organizations using Azure for industrial IoT and operational technology; Saudi telecom providers (STC, Mobily) leveraging Azure for cloud infrastructure; healthcare organizations under MOH using Azure for patient data management. The authenticated nature of the attack reduces immediate risk but poses critical threat to insider threats and compromised service accounts.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Energy and Utilities Telecommunications Healthcare Cloud Service Providers
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Python applications using Azure Core shared client library across your infrastructure
2. Audit service accounts and API credentials with access to affected Azure services
3. Review authentication logs for suspicious activity from service principals

PATCHING GUIDANCE:
1. Update Azure Core shared client library to patched version immediately (consult Microsoft security advisories for specific version numbers)
2. Update all dependent Azure SDK packages (azure-storage, azure-keyvault, azure-identity, etc.)
3. Test patches in non-production environments before production deployment
4. Implement staged rollout to minimize service disruption

COMPENSATING CONTROLS (if immediate patching not possible):
1. Restrict network access to Azure services using network security groups and firewall rules
2. Implement strict RBAC policies limiting service principal permissions to minimum required
3. Enable Azure AD Conditional Access policies requiring MFA for service account authentication
4. Monitor and restrict Python application execution in production environments

DETECTION RULES:
1. Monitor for unusual deserialization operations in Python processes
2. Alert on unexpected code execution from Azure SDK libraries
3. Track changes to service principal permissions and credential usage
4. Monitor for pickle/marshal module usage in Azure-related Python code
5. Implement EDR rules detecting suspicious child process creation from Python interpreters
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع تطبيقات Python التي تستخدم مكتبة Azure Core المشتركة عبر البنية التحتية الخاصة بك
2. تدقيق حسابات الخدمة وبيانات اعتماد API التي لها وصول إلى خدمات Azure المتأثرة
3. مراجعة سجلات المصادقة للنشاط المريب من مبادئ الخدمة

إرشادات التصحيح:
1. تحديث مكتبة Azure Core المشتركة إلى الإصدار المصحح فوراً (استشر إشعارات أمان Microsoft للحصول على أرقام الإصدارات المحددة)
2. تحديث جميع حزم Azure SDK التابعة (azure-storage, azure-keyvault, azure-identity, إلخ)
3. اختبار التصحيحات في بيئات غير الإنتاج قبل نشر الإنتاج
4. تنفيذ طرح مرحلي لتقليل انقطاع الخدمة

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تقييد الوصول إلى شبكة خدمات Azure باستخدام مجموعات الأمان والجدران الناريّة
2. تنفيذ سياسات RBAC صارمة تحد من أذونات مبدأ الخدمة إلى الحد الأدنى المطلوب
3. تفعيل سياسات Azure AD Conditional Access التي تتطلب MFA لمصادقة حساب الخدمة
4. مراقبة وتقييد تنفيذ تطبيقات Python في بيئات الإنتاج

قواعد الكشف:
1. مراقبة عمليات إلغاء التسلسل غير العادية في عمليات Python
2. التنبيه على تنفيذ الكود غير المتوقع من مكتبات Azure SDK
3. تتبع التغييرات في أذونات مبدأ الخدمة واستخدام بيانات الاعتماد
4. مراقبة استخدام وحدات pickle/marshal في كود Python المتعلق بـ Azure
5. تنفيذ قواعد EDR للكشف عن إنشاء عملية فرعية مريبة من مترجمات Python
📋 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.12.2.1 - Monitoring and logging of access
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset Management and Vulnerability Management SAMA CSF PR.IP-12 - Software Development Security SAMA CSF DE.CM-1 - Detection and Analysis
🟡 ISO 27001:2022
ISO 27001:2022 A.12.2.1 - Monitoring and logging ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities ISO 27001:2022 A.14.2.1 - Secure development policy
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and updates PCI DSS 10.2 - Logging and monitoring
📦 Affected Products / CPE 1 entries
microsoft:azure_core_shared_client_library
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorN — None / Network
Attack ComplexityH — High
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-502
EPSS1.70%
Exploit No
Patch ✓ Yes
Published 2026-01-13
Source Feed nvd
Views 3
🇸🇦 Saudi Risk Score
7.8
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-502
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