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Vulnerabilities

CVE-2026-4697

High
Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CWE-754 — Weakness Type
Published: Mar 24, 2026  ·  Modified: Mar 30, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

🤖 AI Executive Summary

CVE-2026-4697 is a high-severity vulnerability (CVSS 7.5) affecting Mozilla Firefox and Thunderbird due to incorrect boundary conditions in the Audio/Video Web Codecs component. This memory safety issue could allow attackers to cause denial of service or potentially execute arbitrary code through specially crafted media content. No patch is currently available, requiring immediate mitigation strategies for affected organizations.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 1, 2026 06:32
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi government entities (NCA, GOSI), banking sector (SAMA-regulated institutions), and telecommunications companies (STC, Mobily) that rely on Firefox/Thunderbird for secure communications and email. Healthcare organizations using these browsers for telemedicine and patient data access are also at risk. The lack of available patches increases exposure window for critical infrastructure and financial institutions.
🏢 Affected Saudi Sectors
Government (NCA, GOSI, Ministry of Interior) Banking and Financial Services (SAMA-regulated institutions) Telecommunications (STC, Mobily, Zain) Healthcare (MOH, private hospitals) Energy (ARAMCO, SEC) Education (Universities, research institutions)
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Firefox and Thunderbird installations across the organization, prioritizing critical systems
2. Disable or restrict access to web-based media content until patches are available
3. Implement network-level controls to block malicious media files (monitor for .mp4, .webm, .ogg files from untrusted sources)
4. Disable JavaScript execution in email clients where possible

COMPENSATING CONTROLS:
5. Deploy web content filtering to restrict access to known malicious media hosting sites
6. Implement email gateway scanning with enhanced media file analysis
7. Use browser sandboxing technologies (Windows Sandbox, macOS security features)
8. Enforce principle of least privilege for browser process permissions
9. Monitor for suspicious process behavior using EDR solutions

DETECTION RULES:
10. Alert on Firefox/Thunderbird crashes with memory corruption indicators
11. Monitor for unusual codec library loading or memory access patterns
12. Track failed media playback attempts followed by system instability
13. Watch for exploitation attempts via crafted media files in email attachments

PATCHING:
14. Subscribe to Mozilla security advisories for patch availability
15. Plan immediate deployment of Firefox 149+ and Thunderbird 149+ when released
16. For ESR versions, upgrade to Firefox ESR 140.9+ and Thunderbird 140.9+ immediately upon release
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع تثبيتات Firefox و Thunderbird عبر المنظمة، مع إعطاء الأولوية للأنظمة الحرجة
2. تعطيل أو تقييد الوصول إلى محتوى الوسائط المستندة إلى الويب حتى توفر التصحيحات
3. تطبيق عناصر تحكم على مستوى الشبكة لحظر ملفات الوسائط الضارة (مراقبة ملفات .mp4 و .webm و .ogg من مصادر غير موثوقة)
4. تعطيل تنفيذ JavaScript في عملاء البريد الإلكتروني حيث أمكن

عناصر التحكم التعويضية:
5. نشر تصفية محتوى الويب لتقييد الوصول إلى مواقع استضافة الوسائط الضارة المعروفة
6. تطبيق فحص بوابة البريد الإلكتروني مع تحليل ملفات الوسائط المحسّن
7. استخدام تقنيات عزل المتصفح (Windows Sandbox و ميزات أمان macOS)
8. فرض مبدأ الامتياز الأقل لأذونات عملية المتصفح
9. مراقبة السلوك المريب للعملية باستخدام حلول EDR

قواعد الكشف:
10. تنبيهات على أعطال Firefox/Thunderbird مع مؤشرات تلف الذاكرة
11. مراقبة أنماط تحميل مكتبة الترميز أو الوصول إلى الذاكرة غير العادية
12. تتبع محاولات تشغيل الوسائط الفاشلة متبوعة بعدم استقرار النظام
13. مراقبة محاولات الاستغلال عبر ملفات وسائط معدة خصيصاً في مرفقات البريد الإلكتروني

التصحيح:
14. الاشتراك في تنبيهات أمان Mozilla لتوفر التصحيحات
15. التخطيط للنشر الفوري لـ Firefox 149+ و Thunderbird 149+ عند إصدارهما
16. بالنسبة لإصدارات ESR، قم بالترقية إلى Firefox ESR 140.9+ و Thunderbird 140.9+ فوراً عند إصدارهما
📋 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 procedures A.12.6.1 - Management of technical vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset management and vulnerability identification PR.IP-12 - Software, firmware, and information integrity mechanisms DE.CM-8 - Vulnerability scans are performed
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy A.12.2.1 - Change management
🟣 PCI DSS v4.0.1
6.2 - Ensure all system components and software are protected from known vulnerabilities
📦 Affected Products / CPE 2 entries
mozilla:firefox
mozilla:firefox
📊 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-754
Exploit No
Patch ✗ No
Published 2026-03-24
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
7.8
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-754
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