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Vulnerabilities

CVE-2026-39820

High
CWE-770 — Weakness Type
Published: May 7, 2026  ·  Modified: May 14, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.

🤖 AI Executive Summary

CVE-2026-39820 is a Denial of Service vulnerability in Go's email parsing functions (ParseAddress, ParseAddressList, ParseDate) that allows attackers to trigger excessive CPU and memory consumption through specially crafted inputs. With a CVSS score of 7.5 and no known public exploits, this vulnerability poses a significant risk to Go-based applications processing untrusted email data. Immediate patching is recommended for all affected Go versions.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 13, 2026 20:34
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations using Go-based email processing systems face significant risk, particularly in: Banking sector (SAMA-regulated institutions processing customer communications), Government agencies (NCA-supervised digital services), Telecommunications (STC, Mobily email services), and Healthcare providers (SEHA systems). Email parsing is fundamental to many backend services, making this vulnerability critical for any organization processing untrusted email input. The DoS nature could disrupt critical communication infrastructure.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Telecommunications Healthcare Energy and Utilities E-commerce Education
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
1. IMMEDIATE ACTIONS:
- Identify all Go applications using net/mail package functions (ParseAddress, ParseAddressList, ParseDate)
- Implement input validation and rate limiting on email parsing endpoints
- Monitor CPU and memory usage for anomalies

2. PATCHING:
- Update Go to the latest patched version immediately
- Rebuild all applications with the updated Go runtime
- Test thoroughly in staging before production deployment

3. COMPENSATING CONTROLS (if patching delayed):
- Implement strict input length limits on email addresses and date fields
- Add timeout mechanisms to parsing operations
- Deploy WAF rules to block malformed email inputs
- Implement circuit breakers for email processing services

4. DETECTION:
- Monitor for: Sustained high CPU usage during email processing
- Alert on: Memory allocation spikes exceeding baseline by >50%
- Log: All ParseAddress/ParseAddressList/ParseDate function calls with input sizes
- Create IDS signatures for excessively long email address strings (>1000 chars)
🔧 خطوات المعالجة (العربية)
1. الإجراءات الفورية:
- تحديد جميع تطبيقات Go التي تستخدم وظائف حزمة net/mail (ParseAddress و ParseAddressList و ParseDate)
- تنفيذ التحقق من صحة المدخلات وتحديد معدل على نقاط نهاية تحليل البريد الإلكتروني
- مراقبة استخدام المعالج والذاكرة للكشف عن الشذوذ

2. تطبيق التصحيحات:
- تحديث Go إلى أحدث إصدار مصحح على الفور
- إعادة بناء جميع التطبيقات مع وقت تشغيل Go المحدث
- الاختبار الشامل في بيئة التجريب قبل نشر الإنتاج

3. الضوابط البديلة (إذا تأخر التصحيح):
- تنفيذ حدود صارمة لطول المدخلات على عناوين البريد الإلكتروني وحقول التاريخ
- إضافة آليات المهلة الزمنية لعمليات التحليل
- نشر قواعد WAF لحجب مدخلات البريد الإلكتروني المشوهة
- تنفيذ قواطع الدوائر لخدمات معالجة البريد الإلكتروني

4. الكشف:
- مراقبة: استخدام المعالج المرتفع المستمر أثناء معالجة البريد الإلكتروني
- التنبيه على: ارتفاعات تخصيص الذاكرة التي تتجاوز الخط الأساسي بنسبة >50%
- السجل: جميع استدعاءات وظائف ParseAddress و ParseAddressList و ParseDate مع أحجام المدخلات
- إنشاء توقيعات IDS لسلاسل عناوين البريد الإلكتروني الطويلة بشكل مفرط (>1000 حرف)
📋 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
ID.RA-1 - Asset management and criticality assessment PR.IP-12 - Software development security practices DE.CM-8 - Vulnerability scans and assessments
🟡 ISO 27001:2022
A.12.2.1 - Change management A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy
🟣 PCI DSS v4.0.1
Requirement 6.2 - Security patches and updates Requirement 11.2 - Vulnerability scanning
📦 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-770
EPSS0.06%
Exploit No
Patch ✓ Yes
Published 2026-05-07
Source Feed nvd
🇸🇦 Saudi Risk Score
7.8
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
patch-available CWE-770
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