📄 Description (English)
Incorrect boundary conditions in the Graphics: Text component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
🤖 AI Executive Summary
CVE-2026-4719 is a high-severity vulnerability (CVSS 7.5) affecting Mozilla Firefox and Thunderbird due to incorrect boundary conditions in the Graphics: Text component. This CWE-754 weakness could allow attackers to cause denial of service or potentially execute arbitrary code through specially crafted text rendering. While no public exploit is currently available, the vulnerability affects widely-used applications across Saudi organizations and requires immediate attention.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 30, 2026 17:14
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government entities, banking sector (SAMA-regulated institutions), and telecommunications companies (STC, Mobily) that rely on Firefox and Thunderbird for secure communications. Government agencies using Thunderbird for email communications face potential data exposure and service disruption. The banking sector could experience operational disruptions during critical transactions. Healthcare organizations and energy sector (ARAMCO) using these applications for communications are also at risk. The vulnerability's impact on text rendering could affect document processing and secure communications across all sectors.
🏢 Affected Saudi Sectors
Government
Banking and Financial Services
Telecommunications
Healthcare
Energy and Utilities
Education
Defense
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Firefox and Thunderbird installations across your organization
2. Disable Firefox and Thunderbird until patches are available, or restrict to non-critical communications only
3. Monitor Mozilla security advisories for patch releases
PATCHING GUIDANCE:
1. Apply Firefox updates to version 149 or later when available
2. Apply Firefox ESR updates to version 140.9 or later when available
3. Apply Thunderbird updates to version 149 or later when available
4. Apply Thunderbird ESR updates to version 140.9 or later when available
5. Enable automatic updates for both applications
COMPENSATING CONTROLS (until patches available):
1. Restrict Firefox/Thunderbird usage to trusted, internal networks only
2. Implement network segmentation to isolate systems running vulnerable versions
3. Use alternative browsers (Chrome, Edge) for critical operations
4. Deploy email clients with better security posture (Outlook for enterprise)
5. Implement application whitelisting to prevent exploitation attempts
DETECTION RULES:
1. Monitor for Firefox/Thunderbird crashes or unexpected terminations
2. Alert on unusual memory consumption patterns in Firefox/Thunderbird processes
3. Track failed text rendering operations in application logs
4. Monitor for suspicious network activity from Firefox/Thunderbird processes
5. Implement EDR rules to detect exploitation attempts targeting text rendering functions
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع تثبيتات Firefox و Thunderbird عبر مؤسستك
2. قم بتعطيل Firefox و Thunderbird حتى توفر التصحيحات، أو قصر الاستخدام على الاتصالات غير الحرجة فقط
3. راقب إشعارات أمان Mozilla للحصول على إصدارات التصحيحات
إرشادات التصحيح:
1. طبق تحديثات Firefox على الإصدار 149 أو أحدث عند توفره
2. طبق تحديثات Firefox ESR على الإصدار 140.9 أو أحدث عند توفره
3. طبق تحديثات Thunderbird على الإصدار 149 أو أحدث عند توفره
4. طبق تحديثات Thunderbird ESR على الإصدار 140.9 أو أحدث عند توفره
5. فعّل التحديثات التلقائية لكلا التطبيقين
الضوابط البديلة (حتى توفر التصحيحات):
1. قصر استخدام Firefox/Thunderbird على الشبكات الداخلية الموثوقة فقط
2. طبق تقسيم الشبكة لعزل الأنظمة التي تشغل الإصدارات الضعيفة
3. استخدم متصفحات بديلة (Chrome, Edge) للعمليات الحرجة
4. استخدم عملاء بريد إلكتروني بموقف أمني أفضل (Outlook للمؤسسات)
5. طبق قائمة بيضاء للتطبيقات لمنع محاولات الاستغلال
قواعد الكشف:
1. راقب أعطال Firefox/Thunderbird أو الإنهاء غير المتوقع
2. أصدر تنبيهات لأنماط استهلاك الذاكرة غير العادية في عمليات Firefox/Thunderbird
3. تتبع عمليات عرض النصوص الفاشلة في سجلات التطبيق
4. راقب النشاط الشبكي المريب من عمليات Firefox/Thunderbird
5. طبق قواعل EDR للكشف عن محاولات الاستغلال التي تستهدف وظائف عرض النصوص
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies and Procedures
A.8.1.1 - User Access Management
A.12.2.1 - Change Management
A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset Management
PR.IP-12 - Software Development and Quality Assurance
DE.CM-8 - Vulnerability Scans
RS.MI-2 - Incidents are mitigated
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
A.12.2.1 - Change management procedures
A.16.1.5 - Response to information security incidents
🟣 PCI DSS v4.0.1
6.2 - Ensure all system components and software are protected from known vulnerabilities
6.3 - Develop and maintain secure coding practices
11.2 - Run automated vulnerability scanning tools
🔗 References & Sources 5
🔗
🔗
https://bugzilla.mozilla.org/show_bug.cgi?id=2016367
security@mozilla.org
Permissions Required
🔗
https://www.mozilla.org/security/advisories/mfsa2026-20/
security@mozilla.org
Vendor Advisory
🔗
https://www.mozilla.org/security/advisories/mfsa2026-22/
security@mozilla.org
Vendor Advisory
🔗
https://www.mozilla.org/security/advisories/mfsa2026-23/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-24/
security@mozilla.org
📦 Affected Products / CPE 2 entries
mozilla:firefox
mozilla:firefox