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Vulnerabilities

CVE-2026-39836

High
CWE-476 — Weakness Type
Published: May 7, 2026  ·  Modified: May 14, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).

🤖 AI Executive Summary

CVE-2026-39836 is a denial-of-service vulnerability in Go's Dial and LookupPort functions on Windows that causes application panics when processing input containing NUL characters. With a CVSS score of 7.5, this affects any Go-based application handling network connections or DNS lookups on Windows systems. Organizations running Go applications in Saudi Arabia should prioritize patching to prevent service disruptions.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 13, 2026 20:34
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi organizations running Go-based applications on Windows infrastructure, particularly: (1) Banking sector (SAMA-regulated institutions) using Go for payment processing or API services; (2) Government agencies (NCA oversight) operating Windows-based Go applications for citizen services; (3) Telecommunications providers (STC, Mobily) using Go for network management tools; (4) Energy sector (ARAMCO, SEC) running Go-based monitoring or control systems; (5) Healthcare institutions managing patient data through Go applications. The DoS impact could disrupt critical services and trigger regulatory compliance violations under SAMA CSF and NCA ECC frameworks.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Telecommunications Energy and Utilities Healthcare Technology and Software Development
⚖️ Saudi Risk Score (AI)
7.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all Go applications running on Windows systems across your infrastructure using asset inventory tools
2. Prioritize applications handling network connections or DNS lookups (Dial/LookupPort functions)
3. Implement input validation to reject or sanitize strings containing NUL characters (0x00) before passing to network functions

Patching Guidance:
1. Update Go runtime to the latest patched version (check golang.org/dl for security releases)
2. Recompile all Go applications with the patched Go version
3. Test applications in staging environment before production deployment
4. Schedule maintenance windows for application restarts

Compensating Controls (if immediate patching not possible):
1. Implement Web Application Firewall (WAF) rules to block requests containing NUL characters
2. Deploy network segmentation to limit exposure of affected applications
3. Enable application monitoring and alerting for panic events
4. Implement rate limiting on network connection endpoints

Detection Rules:
1. Monitor Windows Event Logs for application crashes with panic signatures from Go applications
2. Alert on unexpected termination of Go processes on Windows systems
3. Log and analyze network requests containing %00 or NUL byte sequences
4. Monitor DNS query logs for malformed requests with NUL characters
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع تطبيقات Go التي تعمل على أنظمة Windows عبر البنية التحتية باستخدام أدوات جرد الأصول
2. إعطاء الأولوية للتطبيقات التي تتعامل مع الاتصالات الشبكية أو استعلامات DNS (وظائف Dial/LookupPort)
3. تطبيق التحقق من صحة المدخلات لرفض أو تنظيف السلاسل التي تحتوي على أحرف NUL (0x00) قبل تمريرها إلى وظائف الشبكة

إرشادات التصحيح:
1. تحديث وقت تشغيل Go إلى أحدث إصدار مصحح (تحقق من golang.org/dl للإصدارات الأمنية)
2. إعادة تجميع جميع تطبيقات Go باستخدام إصدار Go المصحح
3. اختبار التطبيقات في بيئة التجريب قبل نشرها في الإنتاج
4. جدولة نوافذ الصيانة لإعادة تشغيل التطبيقات

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تطبيق قواعد جدار حماية تطبيقات الويب (WAF) لحجب الطلبات التي تحتوي على أحرف NUL
2. نشر تقسيم الشبكة لتحديد تعرض التطبيقات المتأثرة
3. تفعيل مراقبة التطبيقات والتنبيهات لأحداث الذعر
4. تطبيق تحديد معدل على نقاط نهاية الاتصال الشبكي

قواعد الكشف:
1. مراقبة سجلات أحداث Windows لأعطال التطبيقات مع توقيعات الذعر من تطبيقات Go
2. التنبيه على الإنهاء غير المتوقع لعمليات Go على أنظمة Windows
3. تسجيل وتحليل طلبات الشبكة التي تحتوي على تسلسلات بايت %00 أو NUL
4. مراقبة سجلات استعلامات DNS للطلبات المشوهة التي تحتوي على أحرف NUL
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.12.2.1 - Change management procedures ECC 2024 A.14.2.1 - Secure development policy
🔵 SAMA CSF
SAMA CSF ID.BE-5.1 - Organizational resilience objectives SAMA CSF PR.IP-12 - Software, firmware, and information integrity mechanisms SAMA CSF DE.CM-1 - The network is monitored to detect potential cybersecurity events
🟡 ISO 27001:2022
ISO 27001:2022 A.12.2.1 - Change management 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 - Ensure that all system components and software are protected from known vulnerabilities
📦 Affected Products / CPE 2 entries
golang:go
golang:go
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityN — None / Network
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-476
EPSS0.02%
Exploit No
Patch ✓ Yes
Published 2026-05-07
Source Feed nvd
🇸🇦 Saudi Risk Score
7.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
patch-available CWE-476
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