📄 Description (English)
monetr is a budgeting application for recurring expenses. In versions 1.12.3 and below, the public Stripe webhook endpoint buffers the entire request body into memory before validating the Stripe signature. A remote unauthenticated attacker can send oversized POST payloads to cause uncontrolled memory growth, leading to denial of service. The issue affects deployments with Stripe webhooks enabled and is mitigated if an upstream proxy enforces a request body size limit. This issue has been fixed in version 1.12.4.
🤖 AI Executive Summary
CVE-2026-40481 is a denial-of-service vulnerability in monetr budgeting application versions 1.12.3 and below affecting the Stripe webhook endpoint. An unauthenticated attacker can send oversized POST requests to exhaust server memory, causing service unavailability. This vulnerability poses significant risk to Saudi financial institutions and fintech companies using monetr for expense management, with exploitation requiring no authentication or special privileges.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 2, 2026 17:47
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi banking sector institutions, fintech companies, and government agencies using monetr for financial management. SAMA-regulated entities and payment service providers integrating Stripe webhooks are at highest risk. Saudi e-commerce platforms and corporate finance departments managing recurring expenses face service disruption risks. The vulnerability could affect business continuity for organizations dependent on monetr for critical financial operations, particularly those without upstream proxy protections.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Fintech and Payment Service Providers
E-commerce and Retail
Healthcare (for expense management)
Telecommunications
Energy and Utilities
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all monetr deployments in your environment and verify if Stripe webhooks are enabled
2. Implement upstream request body size limits (e.g., nginx/Apache max_body_size, WAF rules) to block oversized payloads (recommend 1-5MB limit)
3. Monitor memory consumption on monetr servers for anomalous growth patterns
4. Enable rate limiting on webhook endpoints to restrict POST request frequency
Patching Guidance:
1. Upgrade monetr to version 1.12.4 or later immediately when available
2. If upgrade is not immediately possible, implement compensating controls below
Compensating Controls (if patch unavailable):
1. Deploy WAF rules to reject POST requests exceeding 5MB to /stripe/webhooks endpoint
2. Configure reverse proxy (nginx/Apache) with request body size limits
3. Implement API gateway rate limiting (max 100 requests/minute per source IP)
4. Enable request body validation before processing
Detection Rules:
1. Alert on POST requests to /stripe/webhooks with Content-Length > 5MB
2. Monitor for rapid sequential webhook requests from single IP
3. Track memory usage spikes correlating with webhook endpoint access
4. Log and alert on HTTP 413 (Payload Too Large) responses
5. Implement SIEM rules for abnormal memory consumption patterns on monetr processes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حدد جميع نشرات monetr في بيئتك وتحقق مما إذا كانت Stripe webhooks مفعلة
2. طبق حدود حجم جسم الطلب في المصدر (مثل nginx/Apache max_body_size، قواعد WAF) لحجب الحمولات الكبيرة (يوصى بحد 1-5MB)
3. راقب استهلاك الذاكرة على خوادم monetr للكشف عن أنماط النمو الشاذة
4. فعّل تحديد معدل الطلبات على نقاط نهاية webhook لتقييد تكرار طلبات POST
إرشادات التصحيح:
1. قم بترقية monetr إلى الإصدار 1.12.4 أو أحدث فوراً عند توفره
2. إذا لم يكن الترقية ممكنة على الفور، طبق الضوابط البديلة أدناه
الضوابط البديلة (إذا لم يكن التصحيح متاحاً):
1. نشر قواعد WAF لرفض طلبات POST التي تتجاوز 5MB إلى نقطة نهاية /stripe/webhooks
2. تكوين الخادم الوكيل العكسي (nginx/Apache) بحدود حجم جسم الطلب
3. تطبيق تحديد معدل بوابة API (الحد الأقصى 100 طلب/دقيقة لكل عنوان IP)
4. تفعيل التحقق من صحة جسم الطلب قبل المعالجة
قواعد الكشف:
1. تنبيهات على طلبات POST إلى /stripe/webhooks مع Content-Length > 5MB
2. مراقبة طلبات webhook متتالية سريعة من عنوان IP واحد
3. تتبع ارتفاعات استهلاك الذاكرة المرتبطة بوصول نقطة نهاية webhook
4. تسجيل والتنبيه على استجابات HTTP 413 (Payload Too Large)
5. تطبيق قواعد SIEM لأنماط استهلاك الذاكرة غير الطبيعية على عمليات monetr
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.1.1 - Capacity management and resource monitoring
ECC 2024 A.12.6.1 - Management of technical vulnerabilities
ECC 2024 A.13.1.3 - Segregation of networks
ECC 2024 A.14.2.1 - Secure development policy
🔵 SAMA CSF
SAMA CSF ID.BE-5 - Organizational resilience objectives
SAMA CSF PR.DS-4 - Adequate capacity and performance
SAMA CSF DE.CM-1 - Detection processes and tools
SAMA CSF RS.MI-2 - Incident response procedures
🟡 ISO 27001:2022
ISO 27001:2022 A.5.23 - Information security for supplier relationships
ISO 27001:2022 A.8.1 - User endpoint devices
ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities
ISO 27001:2022 A.14.2.1 - Secure development, implementation and maintenance
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and updates
PCI DSS 11.2 - Vulnerability scanning
PCI DSS 12.2 - Configuration standards for system components
📦 Affected Products / CPE 1 entries
monetr:monetr