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Vulnerabilities

CVE-2026-5559

Medium
A vulnerability has been found in AntaresMugisho PyBlade 0.1.8-alpha/0.1.9-alpha. The affected element is the function _
CWE-791 — Weakness Type
Published: Apr 5, 2026  ·  Modified: Apr 8, 2026  ·  Source: NVD
CVSS v3
6.3
🔗 NVD Official
📄 Description (English)

A vulnerability has been found in AntaresMugisho PyBlade 0.1.8-alpha/0.1.9-alpha. The affected element is the function _is_safe_ast of the file sandbox.py of the component AST Validation. Such manipulation leads to improper neutralization of special elements used in a template engine. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

🤖 AI Executive Summary

CVE-2026-5559 is a template injection vulnerability in PyBlade 0.1.8-alpha/0.1.9-alpha affecting the AST validation sandbox mechanism. The vulnerability allows improper neutralization of special elements in template engines, potentially enabling remote code execution or information disclosure. With no patch available and public exploit disclosure, this poses an immediate risk to organizations using affected PyBlade versions in production environments.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 19, 2026 03:18
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations using PyBlade for web application development, particularly in government digital transformation initiatives, banking sector fintech platforms, and healthcare information systems, face significant risk. The vulnerability is most critical for: (1) SAMA-regulated financial institutions using PyBlade in customer-facing applications, (2) NCA-supervised government agencies implementing digital services, (3) Healthcare providers using PyBlade-based systems for patient data management, (4) Telecom operators (STC, Mobily) using PyBlade in billing or customer portals. The template injection vulnerability could lead to unauthorized access to sensitive data, system compromise, and regulatory non-compliance.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare and Medical Services Energy and Utilities Telecommunications E-commerce and Retail Education
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all systems running PyBlade 0.1.8-alpha or 0.1.9-alpha using software inventory and dependency scanning tools
2. Isolate affected systems from production networks if possible or implement network segmentation
3. Review application logs for suspicious template injection patterns (e.g., unusual template syntax, variable manipulation attempts)
4. Disable or restrict access to PyBlade-based applications until remediation is complete

Patching Guidance:
1. Contact AntaresMugisho project for security updates or timeline
2. Upgrade to a patched version once available (monitor project repository for releases)
3. If upgrade is not immediately possible, consider migrating to alternative template engines (Jinja2, Mako) with proper security configurations

Compensating Controls:
1. Implement Web Application Firewall (WAF) rules to detect and block template injection payloads
2. Apply strict input validation and sanitization for all user-supplied template content
3. Use Content Security Policy (CSP) headers to limit template execution scope
4. Implement template sandboxing at the application level with restricted built-in functions
5. Enable detailed logging and monitoring of template processing activities

Detection Rules:
1. Monitor for AST manipulation attempts in sandbox.py function calls
2. Alert on unusual template syntax patterns: {{__import__}}, {%set%}, {{self}}, {{config}}
3. Track failed template validation events and AST parsing errors
4. Monitor for process execution or file access from template processing contexts
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تعمل بـ PyBlade 0.1.8-alpha أو 0.1.9-alpha باستخدام أدوات المسح والجرد
2. عزل الأنظمة المتأثرة عن شبكات الإنتاج أو تطبيق تقسيم الشبكة
3. مراجعة سجلات التطبيق للبحث عن أنماط حقن القوالب المريبة
4. تعطيل أو تقييد الوصول إلى تطبيقات PyBlade حتى اكتمال المعالجة

إرشادات التصحيح:
1. الاتصال بمشروع AntaresMugisho للحصول على تحديثات أمان أو جدول زمني
2. الترقية إلى نسخة مصححة عند توفرها
3. إذا لم تكن الترقية ممكنة فوراً، فكر في الهجرة إلى محركات قوالب بديلة

الضوابط التعويضية:
1. تطبيق قواعد جدار حماية تطبيقات الويب لكشف حقن القوالب
2. تطبيق التحقق الصارم من المدخلات وتنظيفها
3. استخدام رؤوس سياسة أمان المحتوى
4. تطبيق الحماية الرملية للقوالب على مستوى التطبيق
5. تفعيل السجلات والمراقبة التفصيلية

قواعد الكشف:
1. مراقبة محاولات معالجة AST في وظائف sandbox.py
2. التنبيه على أنماط بناء جملة القوالب غير العادية
3. تتبع أحداث فشل التحقق من صحة القوالب
4. مراقبة تنفيذ العمليات من سياقات معالجة القوالب
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.14.2.1 - Secure development policy and procedures ECC 2024 A.14.2.5 - Secure coding practices and code review ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.12.2.1 - Monitoring and logging of security events
🔵 SAMA CSF
SAMA CSF ID.GV-1 - Organizational governance and risk management SAMA CSF PR.DS-6 - Data protection and secure development SAMA CSF DE.CM-1 - Detection and monitoring of anomalies SAMA CSF RS.MI-2 - Incident response and mitigation
🟡 ISO 27001:2022
ISO 27001:2022 A.8.1 - Asset management and inventory ISO 27001:2022 A.14.2.1 - Secure development policy ISO 27001:2022 A.14.2.5 - Secure coding practices ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and updates PCI DSS 6.5.1 - Injection flaws prevention PCI DSS 11.2 - Vulnerability scanning and assessment
📊 CVSS Score
6.3
/ 10.0 — Medium
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityL — Low / Local
IntegrityL — Low / Local
AvailabilityL — Low / Local
📋 Quick Facts
Severity Medium
CVSS Score6.3
CWECWE-791
EPSS0.02%
Exploit No
Patch ✗ No
Published 2026-04-05
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
7.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-791
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